题解 | 硬币凑钱

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int count = 0;
        int a = 0;
        int b = 0;
        a = n / 7;
        b = n % 7 + 7;
        if (b == 13) {
            count = a + 2;
        } else if (b == 12) {
            count = a + 1;
        } else if (b == 11) {
            count = a -1 +3;
        } else if(b == 10){
            count = a - 1 + 2;
        } else if (b == 9) {
            count = a + 2;
        } else if (b == 8) {
            count = a + 1;
        }
        else count = a;
        System.out.println(count);
        sc.close();
    }
}