#include<iostream>
#include<cstdio>
#include<cctype>
using namespace std;
inline void in(int &x){
    x=0;int f=1;char t=getchar();
    while(!isdigit(t)){if(t=='-')f=-1;t=getchar();}
    while(isdigit(t)){x=x*10+t-48;t=getchar();}
    x*=f;
}
const int maxn=300;
int n,a[maxn],f[maxn][maxn],ans=0;
inline void dp(){
	for(int l=2;l<=n;++l)
		for(int i=1;i<=2*n-l+1;++i)
		{
			int j=i+l-1;
			for(int k=i;k<j;++k)
				f[i][j]=max(f[i][k]+a[i]*a[k+1]*a[j+1]+f[k+1][j],f[i][j]);
			if(l==n)	ans=max(f[i][j],ans);
		}
	printf("%d",ans);
}
inline int work(){
	in(n);
	for(int i=1;i<=n;i++) in(a[i]),a[i+n]=a[i];
	dp();
}
inline int mian(){
	freopen("energy.in", "r", stdin);
    freopen("energy.out", "w", stdout);
    work();
}
int miku=mian();
int main(){;}