5. Write a program that calculates the summation of integers from one to N. Allow the user to input an integer, then pass that number to a function that will calculate the sum of all integers up to N. For example, if the user inputs the number 5, then the function will return the sum 1+2+3+4+5. Allow the user to enter multiple integers, calling the function for each number. Use a sentinel value or similar method to terminate user input