package test.demo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Date;
import java.util.Scanner;

public class Yukicoder784 {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		/*
		 * Scanner sc=new Scanner(System.in); int N =sc.nextInt(); if(N>999) { String
		 * str=String.valueOf(N); int a=str.length()%3; if(a!=0) { String
		 * str2=str.substring(0,a)+","; for(int i=a;i<str.length()-a;i=i+3) {
		 * if(i+3>=str.length()) { str2+=str.substring(i,str.length()); }else {
		 * str2+=str.substring(i,i+3)+","; } } System.out.println(str2); }else { String
		 * str2=""; for(int i=0;i<str.length();i=i+3) { if(i+3>=str.length()) {
		 * str2+=str.substring(i,str.length()); }else { str2+=str.substring(i,i+3)+",";
		 * } } System.out.println(str2); }
		 * 
		 * }else { System.out.println(N); }
		 */
		Scanner stdin = new Scanner(System.in);
        //System.out.printf("%1$,-3d%n", stdin.nextInt());
		//System.out.printf("%tY/%tm/%td%n",new Date(),new Date(),new Date());
		System.out.printf("%,d",stdin.nextInt());

	}

}