答案

#include <bits/stdc++.h>
using namespace std;
int main(){
	int n, x, sum = 0;
	cin >> x >> n;
	while(n){
		if(x % 7 != 0 && x % 7 != 6){
			sum += 250;
		}
		x++;
		n--;
	}
	cout << sum;
	return 0;
}