#include <stdio.h>
int main() {
  int L, N, W[10000] = {0}, i, j, tmp, x;
  scanf("%d %d", &L, &N);
  for (i = 0; i < N; i++) {
    scanf("%d", &W[i]);
  }
  for (i = 0; i < N; i++) {
    for (j = i+1; j < N; j++) {
      if (W[i] > W[j] && j != N) {
        tmp = W[i];
        W[i] = W[j];
        W[j] = tmp;
      }
    }
  }
  for (i = 0; i < N; i++) {
    x += W[i];
    if (x >= L) {
      printf("%d\n", i+1);
      break;
    }
  }
  return 0;
}