#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
#include <numeric>
#include <string.h>
#include <cassert>
 
#ifdef _DEBUG
#define typeof(X) std::identity<decltype(X)>::type //C++0x (for vs2010)
#else
#define typeof(X) __typeof__(X) // for gcc
#endif
 
#define sz(a)  int((a).size())
#define FOREACH(it, c) for (typeof((c).begin()) it=(c).begin(); it != (c).end(); ++it)
#define FOR(i,count) for (int i = 0; i < (count); i++)
 
using namespace std;
typedef long long ll;
const int MODULO = 1000000007;
 
typedef pair<int,int> Pii;
// begin
 
int main()
{
	int n; 
	while(cin>>n,n){
		vector<int> s(n);
		FOR(i,n) cin>>s[i];
		sort(s.begin(),s.end());
		ll ans = 0;
		FOR(i,n) ans += s[i] * (n-i-1);
		cout << ans << endl;
	}

    return 0;
}