#include <stdio.h>

 int main ()

 {
   int n;
   
   int k;
  
	 scanf("%d %d",&n,&k);
  
	 int b=n/k;
  
	 if(b>=k){
   
    printf("%d",n+n/k+b/k);
   
    }else printf("%d",n+n/k);
   
    return 0;
}