[백준 3046] R2

문제

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

3046번: R2

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내가 작성한 코드

import java.io.*;
import java.util.StringTokenizer;

public class qor3046 {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        StringTokenizer st = new StringTokenizer(br.readLine());
        int R1 = Integer.parseInt(st.nextToken());
        int S = Integer.parseInt(st.nextToken());

        int R2 = 2*S - R1;
        bw.write(Integer.toString(R2));
        bw.close();
    }
}