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

int cmmdc(int x,int y)
{int r;
while(y!=0)
    {r=x%y;
     x=y;
     y=r;
    }
return x;
}

int main()
{int n,i,j,nr=0;
ifstream f("fractii.in");
ofstream g("fractii.out");
f>>n;
for(i=1;i<=n;i++)
    for(j=1;j<=n;j++)
        if(cmmdc(i,j)==1)
            nr=nr+1;
g<<nr;
return 0;
}