#include <iostream>
using namespace std;

int main(){
	int x;
	int y;
	int x2;
	int y2;
	int a;
	cin >> x;
	cin >> y;
	cin >> x2;
	cin >> y2;
	if (x != y){
		if (x > y){
			cout << x << endl;
		}
		else{
			cout << y << endl;
		}
	}
	else{
		if (x2 == y2&&x2<x){
			cout << x + 1 << endl;
		}
		else{
			cout << x << endl;
		}
	}


	return 0;
}