#include <iostream>
#include <cstdio>
#define Max 500
using namespace std;

long long a[Max][Max],d[Max+10],n;

void citire()
{
    scanf("%d",&n);
    for(int i=0;i<=n;i++)
        scanf("%d",&d[i]);
}

void sol()
{
    for(int i=1;i<n;i++)
        a[i][i+1]=d[i-1]*d[i]*d[i+1];
    for(int l=2;l<n;l++)
        for(int i=n-l;i>=1;i--)
            {
                int j=i+l;
                int k=i;
                long long m=a[i][k]+a[k+1][j]+d[i-1]*d[k]*d[j];
                for(k=i+1;k<j;k++)
                    m=min(a[i][k]+a[k+1][j]+d[i-1]*d[k]*d[j],m);
                a[i][j]=m;
            }

    printf("%lld",a[1][n]);
}

int main()
{
    freopen("podm.in","r",stdin);
    freopen("podm.out","w",stdout);

    citire();

    sol();
    return 0;
}