#容量、すすりCT、枚数
V,T,P = map(int,input().split())
nakami = 0
CT = 0
t = 0
while nakami <= V:
  if CT <= 0 and nakami > 0:
    nakami -= 1
    CT = T
  if nakami == V and P > 0:
    P -= 1
    nakami = 0
  t += 1
  CT -= 1
  nakami += 1

print(t-1)