#include <bits/stdc++.h>
using namespace std;
map<long long,long long> cnt;
long long n,a[1000001],ans;
int main() {
    scanf("%lld",&n);
    for (long long i = 1;i <= n;i++) {
        scanf("%lld",&a[i]);
        a[i] += a[i-1];
        ans += cnt[a[i]]++;
    }
    printf("%lld",ans+cnt[0]);
    return 0;
}
