#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; cin>>n>>k; int t=n,b=n; for(;b>=k;){ int nc=b/k; t+=nc; b=b-nc*k+nc; } cout<<t; return 0; }