young-physicist.java

import java.util.*;

public class JavaProgram {

    public static void main(String[] args) {

        // System.in and System.out are input and output streams, respectively.

        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();

        int [][] arr = new int[n][3];

        for (int i = 0; i<n; i++){
            for (int j = 0; j<3; j++){
                arr[i][j] = sc.nextInt();
            }
        }

        int x = 0;
        int y = 0;
        int z = 0;

        for (int i = 0;i<n;i++){
            x = x + arr[i][0];
        }
        for (int i = 0;i<n;i++){
            y = y + arr[i][1];
        }
        for (int i = 0;i<n;i++){
            z = z + arr[i][2];
        }

        if (x == 0 && y == 0 && z == 0){
            System.out.println("YES");
        }
        else {
            System.out.println("NO");
        }

    }
}