What does the following Java code output?

import java.util.Collections;
import java.util.List;
import java.util.ArrayList;
public class Main {
    public static void main(String[] args) {
        List<Integer> numbers = new ArrayList<>();
        numbers.add(5);
        numbers.add(10);
        numbers.add(1);
        System.out.println(Collections.max(numbers));
    }
}