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#include <fstream>
#include <iostream>
using namespace std;
int main()
{
int n,i,j,numere=0;
fstream f("fractii.in");
ofstream o("fractii.out");
f>>n;
for(i=2;i<=n;i++)
{
for(j=1;j<=n;j++)
{
if(j==1) numere++;
if(i>j && i%j!=0)
{
numere++; cout<<endl; cout<<i<<' '<<j;
}
else if (i<j && j%i!=0)
{
numere++; cout<<endl; cout<<i<<' '<<j;
}
}
}
o<<numere+n;
return 0;
}