#include<bits/stdc++.h>
using namespace std;
long long qzh[200003],a,n;
int main()
{
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>a;
		qzh[i]=a+qzh[i-1];
	}
	sort(qzh,qzh+(n+1));
	long long ans=0,x=1;
	for(int i=1;i<=n;i++)
		if(qzh[i]!=qzh[i-1])
			ans=ans+x*(x-1)/2,
			x=1;
		else
			x++;
	cout<<ans+x*(x-1)/2;
}