#2、#3，调了很多遍还是WA，求助

#include<bits/stdc++.h>
using namespace std;

int main(){
    int a,b,c;
    cin >> a >> b;
    c = a;
    while(a > b){
        c = c + a/b;
        a = a%b;
    }
    cout << c;
    return 0;
}