#include <bits/stdc++.h>;
using namespace std;

int main()
{
	int m,k,n = 0;
	cin >>m>>k;
	int b=0,day = 0;
	for(;m>=1;)
	{
		m--;
		day++;
		b++;
		if(b==k)
		{
			m++;
			b=0;
		}
	}
	cout <<day;
	return 0;
}