#include <stdio.h>
#include <algorithm>
/*
int CMMDC(int a, int b){
    int r;
    while(b!=0){
        r = a%b;
        a = b;
        b = r;
       }
   return a;
}
*/
int main()
{
    FILE * f;
    f = fopen("fractii.in","r");


    int n,n_fractii,i,j;
    n_fractii = 0;

    fscanf(f,"%d",&n);
    fclose(f);
    n_fractii+=2*n - 1;

    for(i=2;i<=n;i++)
        for(j=2;j<=n;j++)
            if(!(i%j==0 || j%i==0))
                if(std::__gcd(i,j)==1) n_fractii++;
            // if(CMMDC(i,j)==1) n_fractii++;


    FILE * g;
    g = fopen("fractii.out","w");
    fprintf(g,"%d",n_fractii);
    fclose(g);

    return 0;
}