// 
// File:   newmain.cc
// Author: catalaur
//
// Created on January 19, 2008, 1:20 AM
//

#include <stdio.h>
//
// 
//
int cmmdc(long a , long b){
    int x,y;
    if ((a == 1 or b==1) or (a==b+1 or b==a+1))  return 1;
    else{
        do{
            if (a>b) {
                a=a-b;
            }
            if (b>a){
                b=b-a;
            }
        }while (a!=b);
        if (a == 1) {
            return 1;
        }
        else return 0;
    }
}

int main() {
    FILE *fi,*fo;
    long n,i,j,frac;
    fi = fopen("fractii.in" , "r");
    fscanf(fi , "%d" , &n);
    fclose(fi);
    frac=1;
    for (i=1;i<=n;i++){
        for (j=1; j<=n; j++){
            if (i != j){
                if (cmmdc(i,j) == 1) frac++;
            }
        }
    }
    fo = fopen("fractii.out" , "w");
    fprintf(fo , "%1d" , frac);
    return 0;
}