I need to rewrite this code completely, it can have some lines that are the same but it needs to give the same output. I am adding the directions as well for this project.

import java.util.Scanner;

public class GradeCalculation {

public static void main(String[] args) {

//Declare objects

Scanner input = new Scanner(System.in);

//Declare variables

String desiredGrade;

String scoreStatus;

String currentLetterGrade;

int weight1 = 0;

int weight2 = 0;

int weight3 = 0;

int weight4 = 0;

int weight5 = 0;

int weight6 = 0;

int weight7 = 0;

int totalWeight = 0;

int score1 = 0;

int score2 = 0;

int score3 = 0;

int score4 = 0;

int score5 = 0;

int score6 = 0;

int score7 = 0;

double currentScore = 0.0;

double weightTimesScore = 0.0;

double totalKnownGradeWeight = 0.0;

double avgToFinalLetterGrade = 0.0;

double finalOverallScore = 0.0;

//Print grading scale

System.out.println("Grading Scale: ");

System.out.println("A \t 90 - 100");

System.out.println("B \t 80 - 89");

System.out.println("C \t 70 - 79");

System.out.println("D \t 60 - 69");

System.out.println("F \t below 60");

//Prompt user for the grade they want

System.out.print("What letter grade do you want to achieve for the course? ");

desiredGrade = input.nextLine().toUpperCase();

//Check if user entered invalid grade

if (!desiredGrade.equals("A") && !desiredGrade.equals("B") && !desiredGrade.equals("C")

&& !desiredGrade.equals("D") && !desiredGrade.equals("D")) {

System.out.println("Input Error");

System.exit(0);

}

//Prompt user to enter in percentage weights

System.out.println("Enter Percentage Weights:");

System.out.print("Exm 1: \t");

weight1 = input.nextInt();

System.out.print("Exm 2: \t");

weight2 = input.nextInt();

System.out.print("Final Exm: \t");

weight3 = input.nextInt();

System.out.print("Labs: \t\t");

weight4 = input.nextInt();

System.out.print("Projects: \t");

weight5 = input.nextInt();

System.out.print("Attendance: \t");

weight6 = input.nextInt();

System.out.print("Quizzes: \t");

weight7 = input.nextInt();

//Check if the weights add up to 100

totalWeight = weight1 + weight2 + weight3 + weight4 + weight5 + weight6 + weight7;

if (totalWeight != 100) {

System.out.println("Weights don't add up to 100, program exiting...");

System.exit(0);

}

//Prompt user to enter in scores out of a 100

System.out.println("Enter your scores out of a 100:");

//Prompt for exm 1 score

System.out.print("Do you know your Exm 1 score? ");

scoreStatus = input.next().toUpperCase();

if ("Y".equals(scoreStatus) || "YES".equals(scoreStatus)) {

System.out.print("Score received on exm 1: ");

score1 = input.nextInt();

//Prompt for exm 2 score

System.out.print("Do you know your Exm 2 score? ");

scoreStatus = input.next().toUpperCase();

if ("Y".equals(scoreStatus) || "YES".equals(scoreStatus)) {

System.out.print("Score received on exm 2: ");

score2 = input.nextInt();

//Prompt for final exm score

System.out.print("Do you know your Final Exm score?");

scoreStatus = input.next().toUpperCase();

if ("Y".equals(scoreStatus) || "YES".equals(scoreStatus)) {

System.out.print("Score received on final exm: ");

score3 = input.nextInt();

}

else {

weight3 = 0;

}

}

else {

weight2 = 0;

weight3 = 0;

}

}

else {

weight1 = 0;

weight2 = 0;

weight3 = 0;

}

//Prompt for lab average

System.out.print("Do you know your lab average? ");

scoreStatus = input.next().toUpperCase();

if ("Y".equals(scoreStatus) || "YES".equals(scoreStatus)) {

System.out.print("Average Lab Grade: ");

score4 = input.nextInt();

}

else {

weight4 = 0;

}

//Prompt for project average

System.out.print("Do you know your project average? ");

scoreStatus = input.next().toUpperCase();

if ("Y".equals(scoreStatus) || "YES".equals(scoreStatus)) {

System.out.print("Average Project Grade: ");

score5 = input.nextInt();

}

else {

weight5 = 0;

}

//Prompt for quiz average

System.out.print("Do you know your quiz average? ");

scoreStatus = input.next().toUpperCase();

if ("Y".equals(scoreStatus) || "YES".equals(scoreStatus)) {

System.out.print("Average Quiz Grade: ");

score7 = input.nextInt();

}

else {

weight7 = 0;

}

//Prompt for attendance average

System.out.print("Do you know your attendance average? ");

scoreStatus = input.next().toUpperCase();

if ("Y".equals(scoreStatus) || "YES".equals(scoreStatus)) {

System.out.print("Average Attendance Grade: ");

score6 = input.nextInt();

}

else {

weight6 = 0;

}

//Calculate current score & determine current letter grade

weightTimesScore = weight1 * score1 + weight2 * score2 + weight3 * score3 + weight4 * score4

+ weight5 * score5 + weight6 * score6 + weight7 * score7;

totalKnownGradeWeight = weight1 + weight2 + weight3 + weight4 + weight5 + weight6 + weight7;

currentScore = weightTimesScore / totalKnownGradeWeight;

if (currentScore >= 90.0) {

currentLetterGrade = "A";

}

else if (currentScore >= 80.0 && currentScore < 90.0) {

currentLetterGrade = "B";

}

else if (currentScore >= 70.0 && currentScore < 80.0) {

currentLetterGrade = "C";

}

else if (currentScore >= 60.0 && currentScore < 70.0) {

currentLetterGrade = "D";

}

else {

currentLetterGrade = "F";

}

//Display current score & letter grade

System.out.printf("Current Grade Score: %1.2f " , currentScore);

System.out.println("Your current letter grade is a " + currentLetterGrade);

//Determine final overall score

if (desiredGrade.equals("A")) {

finalOverallScore = 90.0;

}

else if (desiredGrade.equals("B")) {

finalOverallScore = 80.0;

}

else if (desiredGrade.equals("C")) {

finalOverallScore = 70.0;

}

else if (desiredGrade.equals("D")) {

finalOverallScore = 60.0;

}

else if (desiredGrade.equals("F")) {

finalOverallScore = 0.0;

}

//Check if user already has desired letter grade

if (currentScore >= finalOverallScore) {

System.out.println("Congratulations! You received the " + desiredGrade + " that you wanted!");

System.exit(0);

}

//Calculate average to final letter grade

avgToFinalLetterGrade = (100 * finalOverallScore - weightTimesScore) / (100 - totalKnownGradeWeight);

//Display average to final letter grade if achievable

if (avgToFinalLetterGrade <= 100) {

System.out.printf("You have to score an average greater than or equal to %1.2f in the remaining grade "

+ "items to receive an " + desiredGrade + " in the course", avgToFinalLetterGrade);

}

else {

System.out.println("Sorry, you cannot receive an " + desiredGrade + " in the course");

}

}

}