#include<iostream> #include<cstdio> //scanf()\printf() #include<cstring> #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n,k,s=0,y; cin>>n>>k; y=n; for(;n>=0&&y>=k;){ s+=n; y=n; n=y/k; y%=k; } cout<<s; return 0; }