Задача I. Ферзь

#include <iostream>
#include <fstream>
#include <cmath>
#include <math.h>


using namespace std;

int a, b, d, e;

int main(int argc, const char * argv[]) {
    cin >> a >> d >> b >> e;
    if(a + d == b + e || a - d == b - e || a == b || d == e){
    	cout << "YES";
    }
    else{
    	cout << "NO";
    }
}