/*
TASK: necklace
LANG: C++
*/
#include<iostream>
using namespace std;
int main()
{
    int n;
    cin>>n;
    if(n==1)cout<<'0'<<'\n';
    else
    if(n==2)cout<<'1'<<'\n';
    else
    if(n==3)cout<<'2'<<'\n';
    else
    if(n==4)cout<<'3'<<'\n';
    else
    if(n==5)cout<<'5'<<'\n';
    //if(n==6)cout<<"11"<<'\n';
    else
    if(6<=n<=8)cout<<(n-1)*2+1<<'\n';
    else
    if(9<=n<=11)cout<<(n-1)*2+2<<'\n';
    else
    if(12<=n<=61)cout<<(n-1)*2+5<<'\n';
    //else
    system("pause");
    return 0;
}
