#include <iostream>
#include <fstream>
using namespace std;
ifstream f("pairs.in");
ofstream g("pairs.out");

unsigned int n,v[100001],contor;

int cmmdc(int a,int b){return (b)?cmmdc(b,a%b):a;}


int main()
{  unsigned int i,x,j;
   f>>n;
   for(i=1;i<=n;i++)
   {f>>x;v[i]=x;}

   for(i=1;i<=n;i++)
    for(j=i;j<=n;j++)
      if(v[i]!=v[j])if(cmmdc(v[i],v[j])==1)contor++;

     g<<contor;
    return 0;
}