#include <iostream>
#include <cstdio>

using namespace std;

int n,d[505],dr[502][502];

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

    scanf("%d",&n);
    for(int i=0;i<=n;i++)
        for(int j=0;j<=n;j++)
            dr[i][j]=0x3f3f3f;
    for(int i=1;i<=n;i++)
    {
        scanf("%d",&d[i]);
        dr[i][i]=0;
    }
    scanf("%d",&d[n+1]);

    int i,j;
    for(int jj=2;jj<=n;jj++)
    {
        for(i=1;i<=n;i++)
        {
            j=jj+i-1;
            for(int k=i;k<j;k++)
                dr[i][j]=min(dr[i][j],dr[i][k]+dr[k+1][j]+d[i]*d[j+1]*d[k+1]);
        }
    }

    printf("%d",dr[1][n]);

    return 0;
}