#include <bits/stdc++.h>

using namespace std;

ifstream fin("pairs.in");
ofstream fout("pairs.out");

int n, v[100007], contor;

int main()
{
    fin >> n;
    for (int i = 1; i <= n; ++i)
    {
        fin >> v[i];
    }
    for (int i = 1; i <= n; ++i)
    {
        for (int j = i + 1; j <= n; ++j)
        {
            if (__gcd(v[i], v[j]) == 1) ++contor;
        }
    }
    fout << contor;
    fin.close();
    fout.close();
    return 0;
}