#pragma GCC optimize ("O3")
#pragma GCC target ("avx")

#include<bits/stdc++.h>
using namespace std;

//INSERT ABOVE HERE
const int MAX = 1<<17;
const int MOD = 1e9+7;
int x[MAX];
int dp[MAX*2]={};
signed main(){
  int k,n;
  cin>>k>>n;
  for(int i=0;i<n;i++) cin>>x[i];
  
  dp[0]=1;
  for(int l=0;l<MAX;l++){
    dp[l]%=MOD;
    for(int i=0;i<n;i++){
      dp[l+x[i]]+=(dp[l+x[i]]+dp[l]>=MOD)?dp[l]-MOD:dp[l];
    }
  }
  cout<<dp[k]<<endl;
  return 0;
}