//pairs
#include<fstream.h>


int main()
{long int n, m[100001],i,j,nr=0,t,a,b,d;

ifstream f("pairs.in");
ofstream g("pairs.out");
f>>n;
for(i=1;i<=n;i++)
	f>>m[i];
for(i=1;i<n;i++)
	for(j=i+1;j<=n;j++)
	   {if(m[i]<m[j]) {a=m[i];b=m[j];}
	                  else {a=m[j];b=m[i];}
        t=0; 
	for(d=2;d<=a && t==0; d++)
		while(a%d==0 && t==0)
			{a/=d;
			if(b%d==0) t=1;}
	if(t==0) nr++;
     }

g<<nr<<'\n';
f.close();
g.close();
return 0;
}