import java.util.HashSet;
public class NewSet extends HashSet
    {
	public int minValue()
	{
	    for (int i=0; i<15; i++)
		if (this.contains(new Integer(i))) return i;
	    return -1;
	}
	public int maxValue()
	{
	    for (int i=14;i>=0;i--)
		if (this.contains(new Integer(i))) return i;
	    return -1;
	}
    }