# ZeroJudge - c079: 10346 - Peter's Smokes
### 題目連結：https://zerojudge.tw/ShowProblem?problemid=c079
###### tags: `ZeroJudge` `數學`

#include <iostream>
using namespace std;

int main() {
	cin.sync_with_stdio(false); cin.tie(nullptr);
	int cigarettes, demand;
	while (cin >> cigarettes >> demand)
		cout << cigarettes + (cigarettes - 1) / (demand - 1) << '\n';
}