C++ :

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,k;
	cin>>n>>k;
	if(n<=k) cout<<2;
	else if(n*2%k==0) cout<<(n*2)/k;
	else cout<<(n*2)/k+1;
	return 0;
}

Pascal :

var n,k:integer;
begin
read(n,k);
if n<=k then write(2)
else write((n*2-1)div k+1);
end.