#include <bits/stdc++.h>
#define rep(i, n) for(long long i = 0; i < n; i++)
#define ALL(v) (v).begin(), (v).end()
#define rALL(v) (v).rbegin(), (v).rend()
using namespace std;

using lint = long long;
using ld = long double;

int main() {
    int l, k;
    cin >> l >> k;
    int q = l / (2 * k) - (l % (2 * k) == 0);
    cout << k * q << endl;
}