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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ifstream f("fractii.in");
ofstream g("fractii.out");
int n ; f >> n ;
int q = 1,p=1;
int contor = 1 ;
int q1,p1;
for (q=1;q<=n;q++)
{
for(p=1;p<=n;p++)
{ q1 = q;p1 = p;
if (p!=q)
{
while (q1!=p1)
{
if (q1>p1) q1 = q1 - p1;
else p1 = p1 - q1 ;
}
if (p1 == 1) {contor++;}
}
}
}
g<<contor;
return 0 ;
}