#include<stdio.h>

int main(void){
    int l, n, i, j;
    int count = 0;
    int sum = 0;
    
    scanf("%d%d", &l, &n);
    int w[n];
    for(i=0;i<n;i++){
        scanf("%d", &w[i]);
    }
    for(i=1;count<n;i++){
        for(j=0;j<n;j++){
            if(w[j]==i){
                sum += i;
                if(sum>l) goto end;
            }
        }
        count++;
    }
    end:;
    printf("%d\n",count);
}