#include <iostream>
#include <fstream>
using namespace std;

int n,i,j,v[1000005],x;

long long s=1;

int main(void)
{
    ifstream f("fractii.in");
ofstream g("fractii.out");
    f>>n;
    x=2;
    s=n*n;
while(x<=n)
    {for (i=1;i<=n;i++)
        {
            v[i]=x;
            if((v[i]%i==0 || i%v[i]==0 )&& i!=1)
                s--;
        }
            x++;
    }
    g<<s;
    f.close();
    g.close();

    return 0;
}