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#include <fstream>
using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
int NON(int a)
{
int impar,par,sum=a,i;
if(a%2==0)
par=impar=a/2;
else
{
par=a/2;
impar=par+1;
}
sum+=(par*impar);
if(a%2==0)
{
for(i=3; i<a; i+=2)
{
for(i=1; i<=a; i++)
{
if(i%a!=0)
sum++;
}
}
}
else
{
for(i=3; i<=a; i+=2)
{
for(i=1; i<=a; i++)
{
if(i%a!=0)
sum++;
}
}
}
return sum;
}
int main()
{
int a;
in>>a;
out<<NON(a);
return 0;
}