#include <iostream>
#include <stdio.h>
using namespace std;
int main()
{
long S=0;
int n;
    FILE *f=fopen("fractii.in","r");
    FILE *g=fopen("fractii.out","w");
    fscanf(f,"%d",&n);
    for(long i=2;i<=n;i++){
        for(long c=i+i;c<=n;c+=i){
                S++;
                for(long j=i+i; j<c; j+=i){
                    if(j%c!=0 && c%j!=0){
                        S++;
                    }
                }
            }
        }
    S=n*n-(2*S)-n+1;
    fprintf(g,"%d",S);
    fclose(f);
    fclose(g);
    return 0;
}