#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000


int main(){
	
	long long n,m;
	cin>>n>>m;
	
	n /= m;
	n /= 1000;
	n *= 1000;
	
	cout<<n<<endl;
	
	return 0;
}