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#include <iostream>
using namespace std;

int main() {
int x, n;
cin >> x >> n;

int total = 0;
for (int i = 0; i < n; i++) {
    int dayOfWeek = (x + i - 1) % 7 + 1; // 计算当前是星期几
    if (dayOfWeek >= 1 && dayOfWeek <= 5) {
        total += 250;
    }
}

cout << total << endl;
return 0;

}