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268 B

#include<bits/stdc++.h>
using namespace std;
int main() {
int n,k;
int s=0,b=0;
cin >> n >> k;
while(1)
{
n--;
s++;
b++;
if(b==k)
{
n++;
b=0;
}
if(n==0 && b<k)
{
break;
}
}
cout<<s;
return 0;
}