#include <bits/stdc++.h>

using namespace std;
const int NMAX = 1e5+5;
int w[NMAX];
long long sol = 0;
int main()
{
    ifstream fin("pairs.in");
    ofstream fout("pairs.out");
    int n, i;
    fin >> n;
    for(i = 1; i <= n; ++i)
        fin >> w[i];

    int j;
    for(i = 1; i < n; ++i){
        for(j = i + 1; j <= n; ++j){
            if(w[i] == w[j])
                continue;

            if(__gcd(w[i], w[j]) == 1)
                ++sol;
        }
    }

    fout << sol;

    return 0;
}