#include <iostream>

using namespace std;

int main()
{
    int n;
    long cont=0;
    
    freopen("fractii.in","r",stdin);
    freopen("fractii.out","w",stdout);
    
    scanf("%d",&n);
    
    for(int i=2;i<=n;++i)
            for(int j=2;j<=n;++j)
                    if((i%j!=0)&&(j%i!=0))
                           cont++;
    
    printf("%ld",cont+(2*n)-1);
    
    return 0;
}