# 4796 캠핑

www.acmicpc.net/problem/4796

4796번: 캠핑

 

# 4796

data = [] 
while True : 
  L, p, v = map(int, input().split() ) 
  if L + p + v == 0 : 
    break 
  else : 
    data.append([L,p,v])

for i in data : 
  L, p, v = i[0], i[1], i[2]

  cnt = ( v//p )*L
  re = v - p*(v//p)

  if re <= L :
    cnt += re
  else : 
    cnt += L
  
  print("Case",str(data.index(i)+1)+":",cnt)