#include <iostream>
#include <fstream>
#define NMAX 5000000000000001
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
long long a[501],d[501][501],n,l[501],c[501],minim,i,j,k;
int main()
{
    f>>n;
    for(i=1;i<=n+1;i++)
    {
        f>>a[i];
    }
    for(i=1;i<=n;i++)
    {
        l[i]=a[i];
        c[i]=a[i+1];
        d[i][i]=0;
    }
    for(i=n-1;i>=1;i--)
    {
        for(j=i+1;j<=n;j++)
        {
            minim=NMAX;
            for(k=i;k<j;k++)
            {
                if(d[i][k]+d[k+1][j]+l[i]*l[k+1]*c[j]<minim)
                {
                    minim=d[i][k]+d[k+1][j]+l[i]*l[k+1]*c[j];
                }
            }
            d[i][j]=minim;
        }
    }
    g<<d[1][n];
    return 0;
}