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#include <bits/stdc++.h>

#include <iostream>

using namespace std;

int main(){

//program to find if subarray exists with sum 0.

int n;

cin>>n;

int arr[n];

for(int i=0;i<n;i++){

cin>>arr[i];

}

bool ans = false;

map<int, int> m;

m[0]++;

int sum = arr[0];

m[sum]++;

for(int i=1;i<n;i++){

sum += arr[i];

if(m[sum]==1){ans = true; break;}

m[sum]++;

}

cout<<ans;

return 0;

}