#include<iostream>

using namespace std;

int main() {
	int x, y, a, b;

	cin >> x >> y >> a >> b;
	

	if (x == y) {
		if (a == b) {
			if (x < a) {
				cout << x << endl;
			}
			else {
				cout << x + 1 << endl;
			}
		}
		else {
			cout << x << endl;
		}
	}
	else if(x < y){
		cout << y << endl;
	}
	else if (x > y) {
		cout << x << endl;
	}


	return 0;
}