Score : 300 points
You are given four integers A, B, C, and D. Find the number of integers between A and B (inclusive) that can be evenly divided by neither C nor D.
Input is given from Standard Input in the following format:
A B C D
Print the number of integers between A and B (inclusive) that can be evenly divided by neither C nor D.
4 9 2 3
2
5 and 7 satisfy the condition.
10 40 6 8
23
314159265358979323 846264338327950288 419716939 937510582
532105071133627368