#include <fstream.h>
ifstream f("fractii.in");
ofstream g("fractii.out");
long n,i,j,x,y,nr;
int main()
{
f>>n;
nr=n;
for (i=2;i<=n;i++)
for(j=1;j<=n;j++)
{
x=i;
y=j;
while(x!=y)
if (x>y)
x=x-y;
else
y=y-x;
if (x==1)
nr++;
}
g<<nr<<'\n';
f.close();
g.close();
return 0;
}