# include<bits/stdc++.h> using namespace std; int main(){ int n,k; int yd=0,zs=0; cin>>n>>k; for(int i=0;i<=n;i++){ yd=n+yd; zs=n+zs; if(yd<k){ break; } else{ n=yd/k; yd=yd%k; } } cout<<zs; return 0; }