public class CountingSeries
{
	public long countThem(long a, long b, long c, long d, long upperBound)
	{
		System.Collections.Generic.List<long> theList = new System.Collections.Generic.List<long>();
		long currentX = -1;
		int x = 0;
		while(currentX <= upperBound)
		{
			currentX = a + (b * x);
			x++;
			if(currentX <= upperBound && !theList.Contains(currentX))
			{
			 theList.Add(currentX);
			}
		}
		currentX = -1;
		x = 0;
		while(currentX <= upperBound)
		{
			currentX = c * ((long)System.Math.Pow(d,x));
			x++;
			if(currentX <= upperBound && !theList.Contains(currentX))
			{
			 theList.Add(currentX);
			}
		}

		return theList.Count;
	}
}