#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    int n,i,j,nr,ok,x;
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    f>>n;
    for(i=2;i<=n;i++)
        for(j=1;j<=n;j++)
        {
        ok=1;
        if(j>i)
        for(x=2;x<=i;x++)
            if((i%x==0) and (j%x==0))
            ok=0;
        else
        for(x=2;x<=j;x++)
            if((i%x==0) and (j%x==0))
            ok=0;
        if(ok==1)
            nr++;
        }
    g<<nr;
    f.close();
    g.close();
    return 0;
}