#include<iostream>
#include<cstdio> 
#include<cmath> 
#include<algorithm>  
using namespace std;
int main(){
	int a,m,n,r=0;
	cin >> m;
	cin >> n;
	for(int i=1;i<=n;i++){
		cin >> a;
		m = m-a;
		if(m<0){
            m = m+a;
            r+=1;
        }
	} 
	cout << r;
	return 0;
}