Summer Institute '17 Contest 1 P8 - Mo' Money

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Points: 5
Time limit: 3.0s
Memory limit: 256M

Problem types

Max has a number of coins and wants to know how many ways he can use some or all of the coins to reach a target value. Can you write a program to help him out?

Input Specification

The first line of input will contain two space separated positive integers, n (n \le 15), the number of coins Max has, and t (t \le 10^6), the target value he wants to reach. The second line of input will contain n space separated positive integers, a_1 through a_n, where a_i (a_i \le 5*10^5) is the value of the i^{\text{th}} coin.

Output Specification

Output a single integer on a line by itself, representing the number of ways Max can combine his coins to reach his target value.

Sample Input 1

6 20
3 10 4 7 3 6

Sample Output 1


Sample Input 2

10 3500
1000 500 750 250 100 800 1200 900 1300 3000

Sample Output 2