题解 | #汽水瓶#

import java.util.Scanner;

public class Main{

public static void main(String[] args){

    Scanner sc = new Scanner(System.in);
    StringBuffer sb = new StringBuffer();

    while(true){
        int empty = sc.nextInt();
        if(empty<1 || empty >100 ) break;
        sb.append(empty / 2);
        sb.append("\n");
    }

    System.out.print(sb);

}

}