# include <stdio.h>
#include<stdlib.h>
int comp(const void *p,const void *q){
	return (*(int*)p-*(int *)q);
}
int main()
{
	int t,n,m,time[100],count=0;
	int i,j;
	scanf("%d",&t);
	for(i=0;i<t;i++){
		count=0;
		scanf("%d%d",&n,&m);
		for(j=0;j<m;j++){
			scanf("%d",&time[j]);
		}
		qsort(time,m,sizeof(int),comp);
		for(j=0;j<m;j++){
		    n-=time[j];
		    if(n>=0)
			    count++;
			else
				break;
		}
		if(i==t-1)
			printf("%d",count);
		else
			printf("%d\n",count);
	}
	return 0;
}