#include <iostream>
#include <cstdlib>
#include <cstdio>
using namespace std;
int main()
{
    FILE *in,*out;
   in=fopen("fractii.in","r");
   out=fopen("fractii.out","w");
    long long n,i,j,nr=0;
    fscanf(in,"%lld",&n);
    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
    {
        if(i==1||j==1)
            nr++;
        else if(i>j&&i%j)
            nr++;
        else if(i<j&&j%i)
            nr++;
    }
    fprintf(out,"%lld",nr);
    return 0;
}