#include <cstdio>
#define inf 10000000LL
using namespace std;

int n,dim[510];
long long a[510][510];

void costop()
{
    int l,i,j,k;
    long long min;
    for(i=1;i<n;i++)
        a[i][i+1]=(long long)dim[i-1]*dim[i]*dim[i+1];
    for(l=2;l<n;l++)
        for(i=1;i<=n-1;i++)
        {
            j=i+l;
            min=inf;
            for(k=i;k<j;k++)
                if(a[i][k]+a[k+1][j]+(long long)dim[i-1]*dim[k]*dim[j]<min)
                    min=a[i][k]+a[k+1][j]+(long long)dim[i-1]*dim[k]*dim[j];
            a[i][j]=min;
        }
}
int main()
{
    freopen("podm.in","r",stdin);
    freopen("podm.out","w",stdout);
    scanf("%d",&n);
    for(int i=0;i<=n;i++)
        scanf("%d",&dim[i]);
    costop();
    printf("%lld\n",a[1][n]);
    fclose(stdin);
    fclose(stdout);
    return 0;
}