import java.util.*;

public class first
{
        private static char equation = '1';
        static boolean matchFound = false;

        public static void main(String[] args)
        {
                checkInt();
        }

        public static void checkInt()
        {
                char[] numbers = {'1','2','3','4','5','6','7','8','9','0'};
                String[] szNumbers = new String[numbers.length];

                for(int i = 0; i < numbers.length; i++)
                {
                    String szEquation =  Character.toString(equation);
                    szNumbers[i] = Character.toString(numbers[i]);

                    if(szNumbers[i].equals(szEquation))
                    {
                        System.out.println("yes");
                        matchFound = true;
                        break;
                    }
                }
                if(!matchFound)
                    System.out.println("no");
        }
}