#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

int n[1010], k[1010];
int main() {
  for (int i = 0; i < 1000; i++) cin >> n[i] >> k[i];
  cout << 500 << endl;
  return 0;
}