#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 my_sum(int x,int y){ int ans=0,j=0; while(x%y!=0){ ans=y; j=x/y; y=x%y; x=ans; } return y; } int n,a[601],cnt; int main(){ cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; } for(int i=1;i<n;i++){ for(int j=i+1;j<=n;j++){ if(my_sum(a[i],a[j])==1){ cnt++; } } } cout<<cnt<<endl; return 0; }