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:
fline=raw_input()
lst=[]
lst=fline.split()
lstt=[]
count=0
for ch in lst:
	lstt.append(int(ch))

for i in range(1,lstt[0]):
	if i%lstt[1]==0 or i%lstt[2]==0:
		count=count+i
print count