#include <stdio.h>
#include <stdlib.h>

int compare(const void *a, const void *b){
  return *(int*)a - *(int*)b;
}

int main(){
  int small[10001];
  int amo;
  int big;
  int sum = 0;

//  printf("input size of bigbox :");
  scanf("%d",&big);
//  printf("input the amount of smallboxes :");
  scanf("%d",&amo);
//  printf("input size of smallboxes\n");
  int i;
  for(i = 0; i < amo; i++){
    printf("%d :",i+1);
    scanf("%d",&small[i]);
  }

  qsort(small, amo, sizeof(int), compare);

  int j = 0;
  while(j < amo && sum < big ){
    sum += small[j++];
  }

  printf("%d\n",j-1);
  return 0;
}