#include <stdio.h>

int main(void){
  int l,n,w[10001],swap;
  scanf("%d",&l); scanf("%d",&n);
  for(int i = 0; i < n; i++)scanf("%d",&w[i]);

  for(int i = 0; i < n; i++){
    int min = 10001,minpoint;
    for(int j = i; j < n; j++){
      if(min > w[j]){
        min = w[j];
        minpoint = j;
      }
    }
    swap = w[i];
    w[i] = w[minpoint];
    w[minpoint] = swap;
  }

  int sum = 0,count;
  for(int i = 0; i < n; i++){
    if(sum >= l)break;
    sum += w[i];
    count++;
  }
  printf("%d\n",count - 1);
}