#include<iostream>
using namespace std;
int main()
{
    int n;
    cin>>n;
    if(n<=0)
    {
        cout<<"Invalid input";
        return 0;
    }
    int coins[n];
    for(int i=0;i<n;i++)
    {
        cin>>coins[i];
        if(coins[i]<=0)
        {
        cout<<"Invalid input";
        return 0; 
        }
    }
    int amount;
    cin>>amount;
    if(amount<0)
    {
         cout<<"Invalid input";
        return 0;
    }
    int dp[amount+1]={0};
    dp[0]=1;
    for(int i=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
    {
        count<<dp[amount];
    }
}