没用循环，简单的膜也能AC

#include<iostream>
using namespace std;
int main()
{
    int k,dayl;
    long long n,dis=0;
    cin>>k>>n;
    if(k<=5) dis+=(6-k)*250;
    n-=6-k+2;
    dis+=n/7*5*250;
    if(n%7<=5) dis+=250*(n%7);
    if(n%7==6) dis+=250*5;
    cout<<dis;
    return 0;
}