public class BitBucket {
    private int[] counts;

    public BitBucket() {
	counts = new int[10];
    }

    private void grow(int size) {
	int[] newElems = new int[size];
	System.arraycopy(counts, 0, newElems, 0, counts.length);
	counts = newElems;
    }

    public void enqueue(int v) {
	if (v >= counts.length)
	    grow(2*v+1);
	counts[v]++;
    }

    public int removeFirst() {
	for (int i=0; i < counts.length; i++) {
	    if (counts[i] > 0) {
		counts[i]--;
		return i;
	    }
	}
	throw new java.util.NoSuchElementException();
    }

    public boolean contains(int v) {
	return counts[v] > 0;
    }

    public boolean isEmpty() {
	for (int i=0; i < counts.length; i++) {
	    if (counts[i] > 0)
		return false;
	}
	return true;
    }
}