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

int main(void)
{
  int L, N, W, i, j, tmp;

  scanf("%d", &L);
  scanf("%d", &N);
  int* array = (int*)malloc(N * sizeof(int));

  scanf("%d", &W);
  array[0] = W;
  
  for (i = 1; i < N; i++) {
    scanf("%d", &W);
    array[i] = W;
    for (j = i; j > 0; j--) {
      if (array[j] < array[j - 1]) {
	tmp = array[j];
	array[j] = array[j-1];
	array[j-1] = tmp;
      }
      else
	break;
    }
  }

  for (i = 0; i < N; i++) {
    L -= array[i];
    if (L <= 0)
      break;
  }

  if (L < 0 || L > 0)
    printf("%d\n", i);
  else
    printf("%d\n", i+1);
  
  return 0;
}