[백준] 3046번 : R2 - Java(자바)

https://www.acmicpc.net/problem/3046

import java.util.*;
public class Main {
    public static void main(String args[]) {
        Scanner sc=new Scanner(System.in);
        int r=sc.nextInt();
        int s=sc.nextInt();
        System.out.format("%d",2*s-r);
    }
}