#include <iostream>

using namespace std;
int ea(int a, int b)
{
    if(a==0)
        return b;
    return ea(b%a,a);
}
int main()
{
    int n;
    cin>>n;
    int s=n;
    for(int i=2;i<=n;++i)
        for(int j=1;j<=n;++j)
            if(ea(i,j)!=1)
                continue;
            else
                s++;
    cout<<s;
    return 0;
}