#include<cstdio>
using namespace std;
int n,v[505],a[505][505];
int main()
{
    int i,j,k,l;
    freopen("podm.in","r",stdin);
    freopen("podm.out","w",stdout);
    scanf("%d",&n);
    for (i=0;i<=n;++i)
        scanf("%d",&v[i]);
    for (i=1,j=1,l=1;j<=n;)
    {
        if (i+1<j)
        {
            for (k=i;k<j;++k)
                if (a[i][j]>a[i][k]+a[k+1][j]+v[i-1]*v[k]*v[j] || !a[i][j])
                    a[i][j]=a[i][k]+a[k+1][j]+v[i-1]*v[k]*v[j];
        }
        else if (i+1==j)
            a[i][j]=v[i-1]*v[i]*v[j];
        ++i, ++j;
        if (j>n) i=1, j=++l;
    }
    printf("%d\n",a[1][n]);
    return 0;
}