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:
s = raw_input("")
a,b,c = s.split()
a = eval(a)
b = eval(b)
c = eval(c)
sum = 0
for i in range(a):
	if i % b==0 or i % c==0:
		sum = sum + i
	else:
		sum = sum
print (sum)