#include<iostream>
using namespace std;

#define U 10000010
int dp[U];
int X[5];
int n, m;
using ll = long long;

ll solve(ll mod){
    for(int i=0;i<U;i++){
        dp[i] = 0;
    }
    dp[0] = 1;
    for(int i=1;i<U;i++){
        for(int j=0;j<m;j++){
            int x = X[j];
            if(x <= i){
                dp[i] += dp[i-x];
            }
            if(dp[i] >= mod){
                dp[i] -= mod;
            }
        }
    }
    if (n < U){
        return dp[n];
    }
    ll ret = 0;
    for(int i=0;i<U;i++){
        for(int j=0;j<m;j++){
            int x = X[j];
            if(i + x < U){
                continue;
            }
            int r = n - i - x;
            ret += (ll)(dp[i]) * (ll)(dp[r]) % mod;
        }
    }
    return ret % mod;
}

int main(){
    cin >> n >> m;
    n--;
    for(int i=0;i<m;i++){
        cin >> X[i];
    }
    ll mod1 = 168647939;
    ll mod2 = 592951213;
    ll mod = mod1 * mod2;
    ll x1 = solve(mod1);
    ll x2 = solve(mod2);
    ll d = (x2 - x1) * 442445312LL % mod2;
    ll x = x1 + d * mod1;
    if(x<0){
        x += mod;
    }
    cout << x << endl;
    return 0;
}