#include<iostream> #include<cmath> //数学 using namespace std; int main(){ int n,k; int yd=0,zs=0; cin>>n>>k; for(int i=1;;i++){ yd = n+yd; zs = n+zs; if(yd<k){ //不够换 break; } else{ n = yd/k; yd = yd%k; } } cout<<zs; }