#include <bits/stdc++.h>   using namespace std;   int main() {     int n, x, y, z;     int sum1 = 0, sum2 = 0, sum3 = 0;     cin >> n;     for (int i = 0; i < n; i++) {       cin >> x >> y >> z;       sum1 += x;       sum2 += y;       sum3 += z;     }     if ((sum1 == 0) && (sum2 == 0) && (sum3 == 0)) {       cout <<  YES  << endl;     } else {       cout <<  NO  << endl;     }     return 0;   }   