题解 | #汽水瓶#

import java.util.Scanner;

public class Main {
public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    while (true){
        int a = sc.nextInt();
        if(a == 0) return;
        System.out.println(a / 2);
    }

// int a = 0;
// while ((a = sc.nextInt()) != 0){
// int b = 0, count = 0;
// while (a >= 3){
// b = a / 3;
// count += b;
// a = a % 3 + b;
// }
// if(a == 2) count++;
// System.out.println(count);
//
// }
}

}