/*
validation
*/

#include <bits/stdc++.h>

#include "testlib.h"

using ll = long long;

const ll min_n = 1, max_n = 2000;
const ll min_val = 1, max_val = 500;

int main() {
    registerValidation();
    ll n = inf.readLong(min_n, max_n);
    inf.readEoln();
    ll h = inf.readLong(min_val, max_val);
    inf.readEoln();
    for(int i = 0; i < n; i++) {
        inf.readLong(min_val, max_val);
        inf.readSpace();
        inf.readLong(min_val, max_val);
        inf.readEoln();
    }
    inf.readEof();
    return 0;
}