#include <stdio.h>

int main(void){
	int l = 0 , n = 0 , i = 0;
	scanf("%d \n%d \n",&l,&n);
	int block[n];
	while(i != n){
		scanf("%d ",&block[i]);
		i++;
	}
	
	for( i = 0  ; i < n ; i++ ){
		for(int j = 0 ; j < n ; j++ ){
			if(block[i] < block[j]){
				int size = block[i];
				block[i] = block[j];
				block[j] = size;
			}
		}
	}
	int max = 0;
	for( i = 0 ; i < n ; i++ ){
		max += block[i];
		if(max >= l){
                printf("%d",i-1);
                break;
            
		}
	}
    if(max < l){
        printf("%d",n);
    }
}