Problem: Given three positive integers N, A and B (A < B < N), find the sum of all positive integers less than N, which are divisible by either A or B.

For example, when N = 20, A = 4 and B = 7, the possible values are 4, 7, 8, 12, 14, and 16. Their sum is 61.
Input Format
The only line of the input file contains three space separated integers N, A and B.

Output Format
Output the required sum.

Constraints
10 ≤ N ≤ 50000
2 ≤ A < B < N

SAMPLE INPUT
20 4 7

SAMPLE OUTPUT
61

Solution (in PYTHON):

Solution:
#! /usr/bin/python

s = raw_input()
lst = s.split(' ')
n = int(lst[0])
a = int(lst[1])
b = int(lst[2])

sum = 0
for x in xrange(a,n,1):
        if (((x % a) == 0) or ((x % b) == 0)):
                sum = sum + x

print sum