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:
a = map(int,raw_input().split())
n = a[0]
x = a[1]
y = a[2]
i = 1
sum = 0
while(i < n):
	if(i%x == 0):
		sum += i
	elif(i%y == 0):
		sum += i
	i += 1
print sum