#include <stdio.h>

/// <summary>
/// 入力された数字を返す
/// </summary>
/// <returns></returns>
long long ReadNum() {
	char c = getchar();
	long long num = 0;
	int numCnt = 0;
	while (c != '\n') {
		num = num * 10 + c - '0';
		c = getchar();
	}
	return num;
}

int main()
{
	long long money = ReadNum()/1000;
	long long kids = ReadNum();
	printf("%lld",(money/kids)*1000);
}