#include "testlib.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,n) for(int i=0;i<(int)(n);i++)

const ll MIN_N = 2;
const ll MAX_N = 200000;

int main(){
	registerValidation();
	inf.readLong(MIN_N, MAX_N);
	inf.readSpace();
	inf.readLong(MIN_N, MAX_N);
	inf.readSpace();
	inf.readLong(MIN_N, MAX_N);
	inf.readSpace();
	inf.readLong(MIN_N, MAX_N);
	inf.readEoln();
	inf.readEof();
}