#include<bits/stdc++.h>
using namespace std;
int t,n,a[100005],dp[100005];
int main(){
    cin>>t>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
    }
    dp[0]=1;
    for(int i=1;i<=n;i++)
    {
        for(int j=a[i];j<=t;j++)
        {
            dp[j]=dp[j]+dp[j-a[i]];
        }
    }
    cout<<dp[t];
    return 0;
}


/**************************************************************
	Problem: 2008
	User: admin
	Language: C++
	Result: Accepted
	Time:61 ms
	Memory:2856 kb
****************************************************************/