v, t, p = map(int, input().split())

ng = 0
ok = 10 ** 25

while abs(ok - ng) > 1:
  mid = (ok + ng) // 2
  if mid - ((mid - 1) // t + 1) >= v * (p + 1):
    ok = mid
  else:
    ng = mid
    
print(ok)