#include <bits/stdc++.h>
using namespace std;
#define REP(i,N) for(i=0;i<N;i++)
typedef long long ll;
typedef pair<int, int> P;
typedef struct{
  int first;
  int second;
  int third;
}T;

//昇順
bool comp_Se(T& l, T& r){
  return l.second < r.second;
}

int main(void){
  ll L,K,y=0;
  cin >> L >> K;
  while(L>0){
    if(L>2*K){
      y+=K;
    }else break;
  }
  cout << y << endl;
  return 0;
}