#include <stdio.h>

int main(void)
{
int h;
int w;
char c[100];
char op;
int i;
int j;
unsigned long long  n;
unsigned long long  m;
unsigned long long a;
scanf("%llu",&n);
scanf("%llu",&m);
a=n/m;
if(a<1000){
	printf("0");
}else if(a%1000){
	a/=1000;
	printf("%d",a*1000);
}else{
	printf("%d",a);
}


	return 0;
}