#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
#define REP(i,n) FOR(i,0,n)
#define sz(n) (int)(n).size()
using namespace std;
typedef long long ll;
typedef vector<int> VI;

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