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#include <cstdio>
#define ValMax 1000005
using namespace std;
bool fr[ValMax];
int cnt[ValMax],a[100005],v[100],len;
inline void Desc(int x)
{
int d=3,k=0;
len=0;
while(x%2==0)
{
++k;
x/=2;
}
if(k) v[++len]=2;
while(x>1 && d*d<=x)
{
k=0;
while(x%d==0)
{
++k;
x/=d;
}
if(k) v[++len]=d;
d+=2;
}
if(x>1) v[++len]=x;
}
int main()
{
int n,i,j,x,nr,produs,stare;
long long sol=0;
freopen ("pairs.in","r",stdin);
freopen ("pairs.out","w",stdout);
scanf("%d", &n);
for(i=1;i<=n;++i)
{
scanf("%d", &a[i]);
Desc(a[i]);
for(stare=1;stare<(1<<len);++stare)
{
produs=1;
for(j=0;j<len;++j)
if((1<<j)&stare)
produs=produs*v[j+1];
++cnt[produs];
}
}
cnt[1]=n;
for(i=1;i<=n;++i)
{
Desc(a[i]);
for(stare=1;stare<(1<<len);++stare)
{
produs=1;
for(j=nr=0;j<len;++j)
if((1<<j)&stare)
{
++nr;
produs=produs*v[j+1];
}
if(nr&1) sol+=cnt[produs]-1;
else sol-=cnt[produs]-1;
}
}
printf("%lld\n", 1LL*n*(n-1)/2-sol/2);
return 0;
}