import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Sample137 {
	public static int sum(String[] input) {
		int sum = 0;
		for (String s: input) {
			sum += Integer.parseInt(s);
		}
		return sum;
	}

	public static void main(String[] args) {
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		try {
			int s = sum(reader.readLine().split("\\s+"));
			int t = sum(reader.readLine().split("\\s+"));
			System.out.println(Math.max(s, t));
		} catch (IOException ex) {
			ex.printStackTrace();
		}
	}
}