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