#include<stdio.h>
//定义n根烟、兑换变量k、最终吸烟量m和烟蒂数c
int main(void)
{
	unsigned n, k,m,c;
	//输入Peter有n根烟，k个烟蒂换一根
	scanf("%d %d", &n,&k);
	c = n;
	for (m=n; c >= k; m++)
	{
		c = c - k + 1;
	}
	printf("Peter最终吸了%d根烟", m);
}