#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int n,i,j,k;
int cmmdc(int a,int b)
{int r;
while(b!=0)
{r=a%b;
a=b;
b=r;

}
    return a;
}
int main()
{fin>>n;
for(i=1;i<=n;i++)
{for(j=1;j<=n;j++)
{if(cmmdc(i,j)==1)
{
    k++;
}

}

}
fout<<k;
fin.close();
fout.close();
return 0;
}