#include<bits/stdc++.h>
#define ll long long
using namespace std;

ll a[205],dp[205][205];
ll n,sum;

int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i],a[i+n]=a[i];
	}
	a[2*n+1]=a[1]; 
	for(int i=2;i<n;i++){
		for(int lt=1;lt+i<=2*n;lt++){
			int rt=lt+i;
			for(int k=lt;k<rt;k++){
				dp[lt][rt]=max(dp[lt][rt],dp[lt][k]+dp[k+1][rt]+a[lt]*a[k+1]*a[rt+1]);
				sum=max(sum,dp[lt][rt]);
			}
		}
	}
	cout<<sum;
	return 0;
}