#include<bits/stdc++.h>
using namespace std;
long long a,b,c[200005],ans;
map<long long,int>n;
int main()
{
	cin>>a;
	n[0]=1;
	for(int s=1;s<=a;s++)
	{
		cin>>b;
		c[s]=b+c[s-1];
		ans=ans+n[c[s]];
		n[c[s]]++; 
	}
	cout<<ans<<endl;
}