#include <bits/stdc++.h>
using namespace std;
int n,a[310];
int calc(int l,int r){
    int i,ans,tmp;
    if (l>r) return 0;
    ans=calc(l+1,r)+(r-l+1)*(r-l+1)*a[l];
    for (i=l+1;i<=r;i++)
    {
        tmp=calc(l,i-1)+calc(i+1,r)+(r-l+1)*(r-l+1)*a[i];
        if (tmp<ans) ans=tmp;
    }
    return ans;
}

int i;
int main()
{
    scanf("%d",&n);
    for (i=1;i<=n;i++) scanf("%d",&a[i]);
    cout<<calc(1,n);
    return 0; 
}