// No.128 お年玉(1)
// https://yukicoder.me/problems/no/128
//

#include <iostream>
using namespace std;

long long int solve(long long int N, int M);


int main() {
    long long N;
    int M;
    cin >> N;
    cin >> M;

    long long ans = solve(N, M);
    if (ans)
        cout << ans << "000" << endl;
    else
        cout << 0 << endl;
}

long long int solve(long long int N, int M) {
    N /= 1000;
    return N / M;
}