a, b, c = input().split()
a = int(a)
b = int(b)
c = int(c)
#年齢
i = 1
money = 0
answer = 0
while i != 0:
  answer = i % a
  if answer == 0:
    money = money + b
  else:
    money += 1
  if money > c or money == c:
    break
  i += 1
print(i)