1. Consider the following situation - In a building there can be N number of floors, to reach on a particular floor we just have stair case. if floor number is even then there would be 10*2+no of floor steps in stair case, if floor number is odd then there would 10*2+10+1 steps. Only floor number 6 is such a floor which has 22 steps. If building has 12 floor, write a program which would help you to find out how many steps would be required to reach any floor.

Sample Input 1 :- 5 Sample Output 1 :- 139

Sample Input 2 :- 10 Sample Output 2 :- 281