#include <fstream>

using namespace std;
unsigned long m[1000000];
int main()
{
    fstream f("pairs.in", ios::in), g("pairs.out", ios::out);
    int i, nr=0, j, a, b, r;
    unsigned long n;
    f>>n;
    for(i=0;i<n;i++)
        f>>m[i];
    for(i=0;i<n;i++)
        for(j=i+1;j<n;j++)
        {
            a=m[i];
            b=m[j];
            r=a%b;
            while(r!=0)
            {
                a=b;
                b=r;
                r=a%b;
            }
            if(b==1)
                nr++;
        }
    g<<nr;
    return 0;
}