#include <fstream>
#include <algorithm>
using namespace std;
ifstream in("pairs.in");
ofstream out("pairs.out");
const int lim=1e5+13;
int v[lim];
int main()
{
    int n,cnt=0;
    in>>n;
    for(int i=1;i<=n;++i)
        in>>v[i];
    for(int i=1;i<=n-1;++i)
    for(int j=i+1;j<=n;++j)
    if(__gcd(v[i],v[j])==1)
    ++cnt;
    out<<cnt;
    return 0;
}