#include"stdio.h"
int main()
{
	int c,d;
	long long a,b;
	scanf("%ld %ld",&a,&b);
	d=a/b;
	if (a>=b)
	c=a+d/b+a/b;
	else
	c=a+a/b;
	printf("%ld",c);
	return 0;
 }