Petr has to apply this simple algorithm to calculate the cost of every slogan he sends. However, Petr is a very busy man (and, as a matter of fact, doesn’t bother to learn arithmetics, because he’s a Philosophy student). You just have to help Petr, you are his best friend after all.
，”过去酒逢知已千杯少，现在酒逢千杯知已少”。
