#include<stdio.h>

int yan(int a,int b){
	int c=a/b;
	if(c!=0)
		return a+yan(c,b);
	return a+c;
}

int main(){
	int a,b;
	scanf("%d %d",&a,&b);
	
	printf("%d\n",yan(a,b));
	
	return 0;
}