#include<iostream>
#include<vector>
#include<algorithm>

#define GAMETIMES 1000
#define SENTE 0
#define GOTE 1

int main() {
	std::vector<int> win;

	for (int i = 0; i < GAMETIMES; i++) {
		int n, k;
		std::cin >> n >> k;
		if (n % (k + 1) == 1) {
			win.push_back(GOTE);
		} else {
			win.push_back(SENTE);
		}
	}

	int sente_win_num = std::count(win.begin(), win.end(), SENTE);
	int gote_win_num = std::count(win.begin(), win.end(), GOTE);

	std::cout << 500 << std::endl;
	return 0;
}