Untitled

#include <iostream>
using namespace std;
int main() {
    int n;
    cin >> n;
    int Digit1 = n / 1000; 
    int Digit2 = (n / 100) % 10; 
    int Digit3 = (n / 10) % 10; 
    int Digit4 = n % 10; 

    if (Digit1 - Digit4 == Digit2 + Digit3) {
        cout << "YES";
    }
    else {
        cout << "NO";
    }

    return 0;
}