import java.util.*;

class GenericMax {
    public static <T extends Comparable<T>> T max(Collection<T> elems) {
	Iterator<T> it = elems.iterator();
	if(it.hasNext()) {
	    T maximum = it.next();
	    while(it.hasNext()) {
		T elem = it.next();
		if(maximum.compareTo(elem) < 0)
		    maximum = elem;
	    }
	    return maximum;
	} else {
	    return null;
	}
    }
}