#include <stdio.h>
#include <stdlib.h>
int cmmdc(int a, int b)
{
    if(a==b)
    return a;
    if(a>b)
    return cmmdc(a-b,b);
    else return cmmdc(a,b-a);
}
int main()
{
    int i,j,k=0;
    FILE *f,*g;
    f=fopen("fractii.in","r");
    fscanf(f,"%d",&n);
    g=fopen("fractii.out","w");
    for(i=1;i<=n;i++)
    for(j=1;j<=n;j++)
    if(cmmdc(i,j)==1)
    k++;
    fprintf(g,"%d",k);
    fclose(f);
    fclose(g);
    return 0;
}