#include<stdio.h>
#define N 100000
int n,m,v[N],nr;
void read()
{
	int i;
	scanf("%d",&n);
	for(i=1;i<=n;i++)
		scanf("%d",&v[i]);
}
int cmmdc(int a,int b)
{
	int r;
	while(b)
	{
		r=a%b;
		a=b;
		b=r;
	}
	return a;
}
void solve()
{
	int i,j;
	for(i=1;i<n;i++)
		for(j=i+1;j<=n;j++)
			if(cmmdc(v[i],v[j])==1)
				nr++;
	printf("%d\n",nr);
}
int main()
{
	freopen("pairs.in","r",stdin);
	freopen("pairs.out","w",stdout);
	read();
	solve();
	return 0;
}