#include <stdio.h>

int main(void) {
    int L=0, N=0, tmp, W[10001]={}, answer=0, f;
    scanf("%d", &L);
    scanf("%d", &N);
    for(int i=0; i<N; i++) {
        scanf("%d", &W[i]);
    }
    for(int p=0; p<N; p++) {
        for(int q=p+1; q<N; q++) {
            if(W[p] > W[q]) {
                tmp = W[p];
                W[p] = W[q];
                W[q] = tmp;
            }
        }
    }
    for(f=0; f<L && answer<N; f+=W[answer]) {
        answer++;
    }
    printf("%d\n", answer);
    return 0;
}