#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

void print(auto a){
  cout << a;
}

void printL(auto a){
  cout << a << endl;
}

void fix(int n){
  cout << fixed << setprecision(n);
}

ll RD(ll n, ll m){
  return n/m;
}

void Oto(ll n, ll m){
  printL(1000*RD(n/1000,m));
}

int main(){
  ll N, M; cin >> N >> M;
  Oto(N, M);
}