#include <iostream>
#include<cstring>
using namespace std;
//本题就是一个01背包问题
const int N = 25;
const int inf = 0x3f3f3f3f;
int v[N];
int f[110];//容量最大是100
int main() {
    int m;
    while (cin >> m) {
        int n;
        cin >> n;
        for (int i = 1; i <= n; i++)
            cin >> v[i];
        memset(f, 0x3f, sizeof f);
        f[0] = 0;
        for (int i = 1; i <= n; i++)
            for (int j = m; j >= v[i]; j--) {
                f[j] = min(f[j], f[j - v[i]]+1);//这个的属性是选了几张邮票
            }
        if (f[m] == inf)cout << 0;
        else cout << f[m] << endl;
    }
}
// 64 位输出请用 printf("%lld")