#include <iostream>

using namespace std;
int cmmdc(int n,int m)
{
    int r;
    r=n%m;
    while(r)
    {
        n=m;
        m=r;
        r=n%m;
    }
    return m;
}

int main()
{int i,j,n,k=0;

    cin>>n;
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
            if((i!=j)&&(cmmdc(i,j)==1))
                    k++;
    cout<<k+1;
    return 0;
}