#include<iostream.h>
#include<fstream.h>
ifstream f("fractii.in");
ofstream g("fractii.out");
long N,i,j;
int k;
int valid(long a, long b)
{long r;
r=a%b;
while(r!=0)
{a=b;
b=r;
r=a%b;
}
return b;
}

int main()
{f>>N; k=2*N-1;
for(i=2;i<=N;i++)
	 for(j=2;j<=N;j++)
		if(valid(i,j)==1) k++;
g<<k;
		f.close(); g.close();
		return 0;
		
}