#include "bits/stdc++.h"
#include<unordered_map>
#include<unordered_set>
#pragma warning(disable:4996)
using namespace std;
using ld = long double;
template<class T>
using Table = vector<vector<T>>;
const ld eps=1e-9;

//// < "D:\D_Download\Visual Studio 2015\Projects\programing_contest_c++\Debug\a.txt"
int main() {
	while (1) {

		int N; cin >> N;
		if (!N)break;
		vector<int>nums(N);
		for (int i = 0; i < N; ++i) {
			cin >> nums[i];
		}
		sort(nums.begin(), nums.end());
		long long int ans = 0;
		for (int i = 0; i < N; ++i) {
			ans += (N - i - 1)*nums[i];
		}
		cout << ans << endl;
	}
	return 0;
}