import java.util.*;
import java.math.*;
import java.text.*;

public class Main {
    private static Scanner sc = new Scanner(System.in);
    public static void main(String[] args) throws Exception {
        int x = sc.nextInt();
        int y = sc.nextInt();
        int x1 = sc.nextInt();
        int y1 = sc.nextInt();
        
        if (x > y) {
            System.out.println(x);
        } else if (y > x) {
            System.out.println(y);
        } else {
            if (x1 == y1 && x1 < x) {
                System.out.println(x+1);
            } else {
                System.out.println(x);
            }
        }
    }
}