#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n,k,s=0,t=0; cin>>n>>k; while(n!=0){ s+=n; t+=n; n=t/k; t=t%k; } cout<<s; return 0; }