#include <iostream>
using namespace std;
int l, n;
void
sort(int* a) {
        int t;
        int i, f = 1;
        while (f && n >= 0) {
                f = 0;
                for (i = 0; i < n-1; i++) {
                        if (a[i] > a[i+1]) {
                                a[i]   ^= a[i+1];
                                a[i+1] ^= a[i];
                                a[i]   ^= a[i+1];
                                f = 1;
                        }
                }
        }
}
int
main() {
        cin >> l >> n;
        int w[n];
        int i;
        for (i = 0; i < n; i++) cin >> w[i];
        sort(w); // 小さい順(昇順）
        for (i = 0; l >= 0; i++)
                l -= w[i];
        if (l = 0) cout << i << endl;
        else cout << i-1 << endl;
        return 0;
}