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How many subsets have the sum of x?
Consider we have a set of n numbers, and we want to calculate the number of subsets in which the addition of all elements equal to x.
Input first line has n, x and the next line contains n numbers of our set. In the output we have to calculate the number of subsets that have total sum of elements equal to x.
INPUT 4 3 -1 2 4 2
OUTPUT 2
