#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int gcd(int m,int n){ int a=m,b=n,c=-1; while(b!=0){ c=b; b=a%b; a=c; } int ans=a; return ans; } int main(){ int n,a[601],ans=0; scanf("%d",&n); for(int i=1;i<=n;i++){ scanf("%d",&a[i]); } for(int i=1;i<n;i++){ for(int j=i+1;j<=n;j++){ if(gcd(a[i],a[j])==1){ ans++; } } } cout<<ans; return 0; }