#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,m,sum=0,a;
	scanf("%d%d",&m,&n);
	for(int i=0;i<n;i++){
		cin>>a;
		sum+=a;
		if(sum>=m){
			printf("%d",i+1);
			return 0;
		}
	}
	printf("NO");
	return 0;
} 
/**************************************************************
	Problem: 1326
	User: godzzw
	Language: C
	Result: Compile Error
****************************************************************/