#include<stdio.h>
#define NUM_BLOCK 10000

int bubblesort();

int main(){
	int wd_box,num_block;
	int wd_block[NUM_BLOCK]={0};
	int sum_wd=0;
	int i;
	
	scanf("%d",&wd_box);
	scanf("%d",&num_block);
	for(i=0; i<num_block;i=i+1){
	scanf("%d",&wd_block[i]);
	}
	
	bubblesort(wd_block,num_block);
	
	for(i=0;i<num_block;i++){
	sum_wd += wd_block[i];
		if(sum_wd>wd_box){
			printf("%d\n",i);
			return 0;
		}
	}
	if(sum_wd<wd_box){
		printf("%d\n",num_block);
	}
	
	return 0;
}

int bubblesort(int wd_block[NUM_BLOCK],int num_block){
	int i,j,baff;
	for(i=0;i<num_block-1;i++){
		for(j=0;j<num_block-1-i;j++){
			if(wd_block[j]>wd_block[j+1]){
			baff = wd_block[j];
			wd_block[j] = wd_block[j+1];
			wd_block[j+1] = baff;
			}
		}
	}
	return 0;
}