sum of odd series

You have given N and Sum of first N odd number is given but in that one number is missing you have to find that number for example : N = 4 Sum = 13 In above example N=4 is given and sum=13 is given we have to find missing number in series . Sum of first 4 odd number is 1+3+5+7 = 16 But sum is given 13 that is the missing number is 3 . ### Input: - First line will contain $T$, number