Java实现 洛谷 P1424 小鱼的航程(改进版)

import java.util.Scanner;

public class Main{
    private static Scanner cin;
    public static int DISTENCE = 250;
    public static int DAYS_A_WEEK = 5;

    public static void main(String args[])throws Exception {
        cin = new Scanner(System.in);
        int x = cin.nextInt();
        long n = cin.nextLong();
        long xn = 0;
        long ret = 0;
        long tmp = 0;
        if(x>=1 && x<=7 && n>0) {

            if(x>=1 && x<=5) {
                tmp = (x-1)*DISTENCE;
            }else if (x>5 && x<= 7) {
                tmp = DAYS_A_WEEK*DISTENCE;
            }

            xn = x + n - 1;

            long t1 = xn/7;
            long t2 = xn%7;
            if (t1 >0) {
                ret = t1*DAYS_A_WEEK*DISTENCE;
            }
            if(t2>=1 && t2<=5) {
                ret += t2*DISTENCE;
            }else if(t2>5 && t2<=7) {
                ret += DAYS_A_WEEK*DISTENCE;
            }

            ret = ret - tmp;

        }
        System.out.println(ret);
    }
}