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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fractii.in");
fstream fout("fractii.out");
int main()
{
int N, i, j, k=0;
fin>>N;
//cin>>N;
for(i=1; i<=N; i++)
{
for(j=1; j<=N; j++)
{
if(i==1 && j==1) k++; //{cout<<i <<'/' <<j; cout<<endl;}
else
{
if(j%i!=0 || i%j!=0) k++; //{cout<<i <<'/' <<j; cout<<endl;}
}
}
}
fout<<k;
//cout<<k;
return 0;
}