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[] x = new int[n]; int[] y = new int[n]; int flag=0; if(n>=2) { for(int a0 = 0; a0 < n; a0++){ x[a0] = in.nextInt(); y[a0] = in.nextInt(); } for(int i=1;i