import java.util.*;
import java.lang.*;
 
class Main
{
    public enum UniqueCodes {
        A(1), B(2), C(3), D(1);
        private static class Holder {
            static Set<Integer> set = new HashSet<Integer>();
        }
        private final int value;
        private UniqueCodes(int value) {
            if (!Holder.set.add(value))
                throw new IllegalArgumentException("Duplicate value: " + value);
            this.value = value;
        }
 
        public int getValue() {
            return value;
        }
    }
	public static void main (String[] args) throws java.lang.Exception
	{
                System.out.println( UniqueCodes.A);
	}
}

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