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:
num=raw_input()
list1=[]
list2=[]
list1=num.split()
N=int(list1[0])
A=int(list1[1])
B=int(list1[2])
for i in range(N):
	if i%A==0:
		list2.append(i)
	elif i%B==0:
		list2.append(i)
sum1=0
for k in list2:
	sum1=sum1+k
print sum1