[BOJ] 15894 수학은 체육과목 입니다 (JAVA)

https://www.acmicpc.net/problem/15894

15894번: 수학은 체육과목 입니다

import java.io.*;

public class Main {
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.print(Long.parseLong(br.readLine()) * 4);
    }
}