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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
float v[1000];
bool Ok(int ct, float x)
{
for(int i=ct; i>=0; i--)
if(v[i]==x)
return false;
return true;
}
int main()
{
int n, ct=0;
f>>n;
for(float i=1.0; i<=n; i++)
for(int j=1; j<=n; j++)
if(Ok(ct, i/j))
{
v[ct++]=i/j;
}
g<<ct;
return 0;
}