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#include<fstream>
#include<iostream>
#include<math.h>
#include<stdio.h>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int n,i,j,nr,ok,k;
float a[1000];
float x;
int main()
{ f>>n;
nr=0;
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
{ok=0; x=1.0*i/j*1.0;
for(k=1;k<=nr;k++)
if(a[k]==x)
ok=1;
if(ok==0)
{nr++;
a[nr]=1.0*i/j*1.0;
}
}
g<<nr;
return 0;
}