#include <bits/stdc++.h>   using namespace std;   int main() {     int n, sum[3] = {0};     cin >> n;     int *x = new int[n], *y = new int[n], *z = new int[n];     for (int i = 0; i < n; i++) {       cin >> x[i] >> y[i] >> z[i];       sum[0] += x[i];       sum[1] += y[i];       sum[2] += z[i];     }     if (sum[0] == 0 && sum[1] == 0 && sum[2] == 0)       cout <<  YES ;     else       cout <<  NO ;     delete[] x;     delete[] y;     delete[] z;     return 0;   }   