#include<iostream>
#include<fstream>
using namespace std;
int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    int n,a,b,nr=0;
    f >> n;
    a=1;
    b=1;
    while(a<=n)
    {
        if(a&b!=0 || b==1)
            nr++;
        b++;
        if(b==n)
        {
            if(a&b!=0)
                nr++;
            a++;
            b=1;
        }

    }
    g<<nr;
    return 0;
}