#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <math.h>

int main()
{
	long long maney = 0;
	long long children = 0;
	long long divisionManey = 0;
	long long giveManey = 0;

	scanf("%lld", &maney);
	scanf("%lld", &children);

	divisionManey = maney / children;

	if (divisionManey < 1000)
	{
		printf("0\n");
		return 0;
	}

	if (divisionManey % 1000 == 0)
	{
		printf("%lld\n", divisionManey);
		return 0;
	}

	if (divisionManey >= 1000)
	{
		divisionManey /= 1000;
		giveManey = divisionManey * 1000;

	}

	printf("%lld\n", giveManey);

	return 0;
}