#include <algorithm>
#include <cstdio>
#include <iostream>
#include <string>
#include <vector>
#include <map>
#define rep(i, n) for (int i=0; i<n; ++i)
#define FOR(i, a, b) for (int i=a; i<b; ++i)
#define pb(x) push_back(x)
#define ll long long
#define ul unsigned long long
#define debug(x) cout  << #x << " : " << x << endl;
using namespace std;

const int Inf =1500000000;
int main () {
  ll n, m,res =0;
  cin >> n>>m;
  for (ll i=1000; n >= m*i;i+=1000 ) {
    res=i; 
  }
   cout << res   << endl;
   return 0;
}