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#include <iostream>
#include <fstream>
using namespace std;
int main()
{ ifstream f("fractii.in");
ofstream g("fractii.out");
int n,i,j,c=0;
f>>n;
for(i=1;i<=n;++i)
for(j=1;j<=n;++j)
{if(j==1) c++;
if(i==1) {if(i!=j)
if(i%j!=0) c++;}
else {if(i!=j)
if(i%j!=0 && j%i!=0) c++;}
}
g<<c;
f.close();
g.close();
return 0;
}