#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int main()
{
	int smoke = 0, chang = 0, m=0, stub=0;
	scanf("%d %d", &smoke, &chang);
	m = smoke / chang;
	stub = smoke + m;
	if (m>=chang)
	{
		m = stub / chang;
		stub = smoke + m;
	}
	printf("%d", stub);
	return 0;
}