#include <bits/stdc++.h>

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

int v[100005],rasp,n,maxim;
int frecv[1000005];
bool apar[1000005];

int main()
{
    fin>>n;
    for(int i=1;i<=n;i++)
    {
        fin>>v[i];
        frecv[v[i]]++;
        maxim=max(maxim,v[i]);
    }
    sort(v+1,v+n+1);
    for(int i=1;i<=n;i++)
    {
        int rez=n-i;
        int nr=v[i];
        if(nr%2==0)
        {
            for(int j=v[i]+2;j<=maxim;j+=2)
            {
                apar[j]=1;
                if(frecv[j])rez-=frecv[j];
            }
            while(nr%2==0)
                nr/=2;
        }
        for(int j=3;j*j<=nr;j+=2)
        {
            if(nr%j==0)
            {
                for(int k=v[i]+j;k<=maxim;k+=j)
                {
                    apar[k]=1;
                    if(frecv[k])rez-=frecv[k];
                }
                while(nr%j==0)
                    nr/=j;
            }
        }
        if(nr>1)
        {
            for(int j=v[i]+nr;j<=maxim;j+=nr)
            {
                apar[j]=1;
                if(frecv[j])rez-=frecv[j];
            }
        }
        rasp+=rez;
    }
    fout<<rasp;
}