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#include<iostream>
#include<fstream>
using namespace std;
int i,j,N,ok,k,m;
int main()
{
ifstream f("fractii.in");
ofstream g("fractii.out");
f>>N;
k=1;
for(i=1;i<=N;i++)
for(j=1;j<=N;j++)
{
ok=0;
if(i<j)
{for(m=2;m<=i;m++)
if(i%m==0&&j%m==0) ok=1;
if(ok==0) k++;}
else if(j<i)
{for(m=2;m<=j;m++)
if(i%m==0&&j%m==0) ok=1;
if(ok==0) k++;}
}
g<<k;
return 0;
}