A316.小鱼的航程题解

#include<iostream>
using namespace std;
int main(){
    unsigned int x,i;
    int n,y=0;
    cin>>x>>n;
    if(n==0){
        cout<<0;
        return 0;
    }
    for(i=x;i<x+n;i++){
        if(i%7==0||i%7==6){}
        else{
            y+=250;
        }
    }
    cout<<y;
}