#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int main()
{   int n,p=1,q,c=0,d,ok;
    f>>n;
    while(p<=n){
        for(q=1;q<=n;q++){

            if(q==1 && p==1){ c++;}
            if(q!=p){




                if(q>=p){
                d=2;
                while(d<=q/2){
                    if(q%d==0 && p%d==0) ok=0;
                        d++;
                }}else{
                d=2;
                while(d<=p/2){
                    if(q%d==0 && p%d==0) ok=0;
                        d++;
                }
                }
            if(ok==1) {c++;}
            }
        }
        p++;
        }
    g << c << endl;
    f.close();
    g.close();
    return 0;
}