#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
	int n;
	while (cin >> n, n) {
		vector<int> ts;
		for (int i = 0; i < n; i++) {
			cin >> ts[i];
		}
		sort(ts.begin(), ts.end());
		long long sum = 0, ans = 0;
		for (int i = 0; i < n; i++) {
			ans += sum;
			sum += ts[i];
		}
		cout << ans << endl;
	}
}