#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,k;
    cin>>n>>k;
    int x[100000000];
    int i=0;
    while(n>k)
    {
        x[i]=n/k;
        i+=1;
        n=n/k;
    }
    n=n/k;
	cout<<n+n/k+x;
	return 0;
}