#include <iostream>
#include <fstream>
#include <climits>
#define INF   100000000000000000LL
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
int n, a[501];
unsigned long long d[501][501],minm;
int main()
{
    f>>n;
    for(int i=0; i<=n; i++)
        f>>a[i];
    for(int j=1; j<n; j++)
        d[j][j+1]=1LL*a[j-1]*a[j]*a[j+1];
    for(int i=2; i<n; i++)
        for(int j=1; j<=n-i; j++)
        {
            minm =INF;
            for(int k=j; k<i+j; k++)
            {
                if(minm>d[j][k]+d[k+1][i+j]+1LL*a[j-1]*a[k]*a[j+i])
                    minm=d[j][k]+d[k+1][i+j]+1LL*a[j-1]*a[k]*a[j+i];
            }
            d[j][i+j]=minm;
        }
    g<<d[1][n]<<'\n';
}