#include<bits/stdc++.h>
using namespace std;
 
int main(){
	int n;
	cin>>n;
	
	long long int sum=0,x,a[200001];
	a[0]=0;
	for (int i = 1; i <= n; i++){
		cin>>x;
		sum+=x;
		a[i]=sum;
	}

	sort(a,a+n+1);

	long long int ans=0
	int count=1;
	for (int i = 1; i <= n; i++){
		if(a[i]==a[i-1])
			count++;
		else{
			ans+=count*(count-1)/2;
			count=1;
		}
	}
	ans+=count*(count-1)/2;  //最後のチェックの反映

	cout<<ans<<endl;

}
