import std.stdio, std.conv, std.string, std.range, std.array, std.algorithm;

int main(){
	auto L = readln.strip.to!int;
	auto N = readln.strip.to!int;
	auto A = readln.strip.split.to!(int[]).sort!("a<b");
	
	int cnt = 0;
	foreach(int a; A){
		L-=a;
		if(L<0) break;
		cnt++;
	}
	cnt.writeln;
	return 0;
}