# include<iostream> using namespace std; int gcd(int a,int b){ int c=-1; while(c!=0){ c=a%b; a=b; b=c; } return a; } int main(){ int p[600],n,sum=0; cin>>n; for(int i=1;i<=n;i++){ cin>>p[i]; } for(int i=1;i<n;i++){ for(int j=i+1;j<=n;j++){ if(gcd(p[i],p[j])==1) sum++; } } cout<<sum; return 0; }