#include <stdio.h> int main() { int n; int sum1=0, sum2=0, sum3=0; int x, y, z; scanf("%d", &n); int i; for(i=0; i<n; ++i) { scanf("%d %d %d", &x, &y, &z); sum1+=x; sum2+=y; sum3+=z; } if((sum1==0)&&(sum2==0)&&(sum3==0)) printf("YES\n"); else printf("NO\n"); return 0; }