#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;

int main(){
  int n;
  while(cin >> n,n){
    vector<int> time;
    for (int i = 0; i < n; i++){
      int tmp;
      cin >> tmp;
      time.push_back(tmp);
    }
    sort(time.begin(), time.end());
    int ans = 0;
    for (int i = 0; i < n - 1; i++){
      ans += time[i] * (n - (i + 1));
    }
    cout << ans << endl;
  }
  return 0;
}