题解 | #计算机内存#

import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        //转换成统一单位进行运算
        System.out.println(n * 1024 * 1024 / 4);
    }
}