#include <stdio.h>
int main(void)
{

  int block[10000];
  int L,N,j,k,c,i=0;
  int a=0;

  scanf("%d",&L);
  while(L<1||L>10000){
    scanf("%d",&L);
  }
  scanf("%d",&N);
  while(i<N){
    scanf("%d",&block[i]);
    i++;
  }

  for(i=0;i<N;i++){
    for(j=i+1;j<N;j++){
      if(block[i]>block[j]){
        k=block[i];
        block[i]=block[j];
        block[j]=k;
      }
    }
  }

  if(block[0]>L){
    printf("0\n");
  }
  else{
    for(i=0;i<N;i++){
      a+=block[i];
      if(a>=L){
        c=i;break;
      }
      c=N;
    }
  }
  printf("%d\n",c);

return 0;
}