#include<cstdio>
#include<cstring>
#include<cctype>
#include<cstdlib>
#include<cmath>
#include<iostream>
#include<sstream>
#include<iterator>
#include<algorithm>
#include<string>
#include<vector>
#include<set>
#include<map>
#include<deque>
#include<queue>
#include<stack>
#define pr(x) cout << #x << " : " << x << "   "
#define prln(x) cout << #x << " : " << x << endl
#define Size(x) (int)((x).size())
#define fi(x) ((x).first)
#define se(x) ((x).second)
typedef long long LL;
typedef unsigned long long ULL;
const int INT_INF = 0x3f3f3f3f;
const int INT_M_INF = 0x7f7f7f7f;
const LL LL_INF = 0x3f3f3f3f3f3f3f3f;
const LL LL_M_INF = 0x7f7f7f7f7f7f7f7f;
const double pi = acos(-1.0);
using namespace std;
inline void debug(char ch){for(int __ii = 0; __ii < 20; ++__ii)putchar(ch);printf("\n");}
const double eps = 1e-8;
inline int dcmp(double a, double b) {if(fabs(a - b) < eps)  return 0;return a < b ? -1 : 1;
}
#define fin freopen("in.txt", "r", stdin)
#define fout freopen("out.txt", "w", stdout)
const int MAXN = 100 + 10;
const int MAXT = 100000 + 5;
LL dp[MAXN][MAXN];
LL a[MAXN];
int main() {int n;scanf("%d", &n);for(int i = 0; i < n; ++i){scanf("%lld", &a[i]);}for(int l = 1; l < n; ++l){for(int i = 0; i < n; ++i){int j = (i + l) % n;for(int k = i; k != j; k = (k + 1) % n){dp[i][j] = max(dp[i][j], dp[i][k] + dp[(k + 1) % n][j] + a[i] * a[(k + 1) % n] * a[(j + 1) % n]);}}}LL ans = 0;for(int i = 0; i < n; ++i){int j = (i + n - 1) % n;ans = max(ans, dp[i][j]);}printf("%lld\n", ans);return 0;
}