[코드업] 기초 100제 Java로 풀기 - 1047

package codeup_100;

import java.util.Scanner;

public class codeup_47 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int a = sc.nextInt();
		System.out.println(a<<1);
	}
}