#include <iostream>
#include<fstream>
#define inf 100000000000000000LL
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
int n,i,j,k;
long long m[510][510],d[510];
int main()
{
    f>>n;
    for(i=0;i<=n;i++)
        f>>d[i];
    for(i=1;i<n;i++)
        m[i][i+1]=d[i-1]*d[i]*d[i+1];
    for(j=2;j<n;j++)
        for(i=1;i<=n-j;i++)
    {
        m[i][i+j]=inf;
        for(k=i;k<i+j;k++)
            if(m[i][k] + m[k+1][i+j] + d[i-1]*d[k]*d[i+j] < m[i][i+j])
                m[i][i+j]=m[i][k] + m[k+1][i+j] + d[i-1]*d[k]*d[i+j];
    }
    g<<m[1][n];
}