小心陷阱

 k = int(input())

x1,y1=map(int,input().split())

x2,y2 =map(int,input().split())

x = 0

while k>0:

  x = x +ｋ

  if x%x1==0:k = k - y1

  if x%x2==0:k = k - y2

print(x)

 

data:

7

3 2

2 3

Output:

18