#include <iostream>>
using namespace std;
int main () {
int a,b,h=0;
cin>>a>>b;
h=a;
if (h<b || h==0) { cout<<h; return 0; }
else {
while (a>=b) {
h+=a/b; a=(a%b)+(a/b);
}
}
cout <<h;
return 0;
}
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