import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] x1 = new int[n];
        int[] y1 = new int[n];
        int soma = 0;
        int somay = 0;
        for(int a0 = 0; a0 < n; a0++){
            int x = in.nextInt();
            int y = in.nextInt();
            x1[a0] = x;
            y1[a0] = y;
            soma = soma + x;
            somay = somay + y;           
        }
         if(soma == 0 || somay == 0)
                System.out.print("YES");
        else
            System.out.print("NO");
    }
}