#include <bits/stdc++.h>

using namespace std;

#define REP(i,a,b) for(int i=a;i<(int)b;i++)
#define rep(i,n) REP(i,0,n)

int main() {

  long long L, K; cin >>L>>K;cout<<(L-1)/(K<<1)*K<<endl;
  return 0;
}