HashSet<Integer> hs = new HashSet<>();
for(int i = 0 ; i< n; i++){
arr[i] = sc.nextInt();
hs.add(arr[i]);
}
int num = hs.size();
int ans = 0;
int count = 1;
// System.out.println("NUM: "+ num);
for(int i = num; i>= 1; i--){
ans += i*count;
// System.out.println("count: "+count);
// System.out.println("num :"+i);
// System.out.println("count*num :"+ count*i);
count++;
}
System.out.println(ans);