#include<iostream>
#include<vector>
using namespace std;
int main()
{
    int n;cin>>n;
    if(n<0)
    {
        cout<<"Invalid input";
        return 0;
    }
    vector<int>coins(n);
    for(int i=0;i<n;i++)
    {
        if(coins[i]<0)
        {
        cout<<"Invalid input";
        return 0;
        }
    }
    int amount;
    cin>>amount;
    if(amount<0)
    {
        cout<<"Invalid input";
        return 0;
    }
    vector<long long>dp(amount+1,0);
    dp[0]=1;
    for(inti=0;i<n;i++)
    {
        for(int j=coins[i];j<=amount;j++)
        {
            dp[j]+=dp[j-coins[i]];
        }
    }
    if(dp[amount]==0)
    cout<<"No";
    else
    cout<<dp[amount];
    return 0;
}