/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone {
	private static final int TARGET = 21;
	public static void main (String[] args) throws java.lang.Exception {
        System.out.println(blackjack(22,22));
        System.out.println(blackjack(25,25));
        System.out.println(blackjack(19,25));
        System.out.println(blackjack(25,19));
        System.out.println(blackjack(10,10));
        System.out.println(blackjack(19,10));
        System.out.println(blackjack(1,19));
	}
	
	public static int blackjack(int a, int b) {
        if ( a > TARGET && b > TARGET) {
            return 0;
        }
        
        return Math.abs(a - TARGET) < Math.abs(b - TARGET) 
           ? a 
           : b;
    }
}