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#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;
int main()
{
ifstream f("fractii.in");
ofstream g("fractii.out");
int n,r=1,ok,s=1,k;
int i,j;
f>>n;
float v[n*n];
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
{v[r]=float(i)/float(j);r++;}
for(i=2;i<=r-1;i++)
{
ok=1;
for(j=1;j<i;j++)
if(v[i]==v[j])ok=0;
if(ok)s++;
}
g<<s;
f.close();
g.close();
}