#include<cstdio>
using namespace std;
int n,v[511],a[511][511];
void read()
{
    freopen("podm.in","r",stdin);
    freopen("podm.out","w",stdout);
    scanf("%d",&n);
    int i;
    for(i=1;i<=n+1;i++)
        scanf("%d",&v[i]);
}

void rez()
{
    int min,val,i,j,k;
    for(i=n;i>=1;i--)
        for(j=i+1;j<=n;j++)
        {
            min=2147483645;
            for(k=i;k<j;k++)
                {
                    val=a[i][k]+a[k+1][j]+v[i]*v[k+1]*v[j+1];
                    if(val<min)
                        min=val;
                }
            a[i][j]=min;
        }
    printf("%d\n",a[1][n]);
}

int main()
{
    read();
    rez();
    return 0;
}