#include <bits/stdc++.h>   using namespace std;   long long exp(long long x, long long y, long long p) {     long long res = 1;     while (y) {       if (y % 2) res = (res * x % p) % p;       x = (x * x) % p;       y /= 2;     }     return res;   }   long long exp(long long x, long long y) {     long long res = 1;     while (y) {       if (y % 2) res = (res * x);       x = (x * x);       y /= 2;     }     return res;   }   int main() {     long long a, b, c;     long long sum1 = 0, sum2 = 0, sum3 = 0;     long long t;     cin >> t;     while (t--) {       cin >> a >> b >> c;       sum1 += a;       sum2 += b;       sum3 += c;     }     if (!sum1 && !sum2 && !sum3)       cout <<  YES  << endl;     else       cout <<  NO  << endl;     return 0;   }   