#include <fstream>
#include <bitset>

class InputReader {
    public:
        InputReader() {}
        InputReader(const char *file_name) {
            input_file = fopen(file_name, "r");
            cursor = 0;
            fread(buffer, SIZE, 1, input_file);
        }
        inline InputReader &operator >>(int &n) {
            while(buffer[cursor] < '0' || buffer[cursor] > '9') {
                advance();
            }
            n = 0;
            while('0' <= buffer[cursor] && buffer[cursor] <= '9') {
                n = n * 10 + buffer[cursor] - '0';
                advance();
            }
            return *this;
        }
    private:
        FILE *input_file;
        static const int SIZE = 1 << 17;
        int cursor;
        char buffer[SIZE];
        inline void advance() {
            ++ cursor;
            if(cursor == SIZE) {
                cursor = 0;
                fread(buffer, SIZE, 1, input_file);
            }
        }
};

#define lint long long int
using namespace std;

const int NMAX = 100005;
const int VALMAX = 1000000;

int factor[VALMAX + 5];
int mobius[VALMAX + 5];

inline void erat () {
    int j;
    for (int i = 2; i <= VALMAX; ++ i)
        if (!factor[i])
            for (j = i; j <= VALMAX; j += i)
                factor[j] = i;

    mobius[1] = 1;
    for (int i = 2; i <= VALMAX; ++ i)
        if (factor[i] != factor[i / factor[i]])
            mobius[i] = (-1) * mobius[i / factor[i]];
}

int frecv[VALMAX + 5];

int main()
{
    InputReader cin("pairs.in");
    ofstream cout("pairs.out");

    erat();

    int n = 0;
    cin >> n;

    int val;
    for (int i = 1; i <= n; ++ i) {
        cin >> val;
        ++ frecv[val];
    }

    int j;
    for (int i = 1; i <= VALMAX; ++ i)
        for (j = 2 * i; j <= VALMAX; j += i)
            frecv[i] += frecv[j];

    lint ans = 0;
    for (int i = 1; i <= VALMAX; ++ i)
        if (mobius[i] != 0)
            ans += mobius[i] * (frecv[i] * (frecv[i] - 1ll)) / 2;

    cout << ans << '\n';

    //cin.close();
    cout.close();
    return 0;
}