#include<cstdio>
using namespace std;
int d[501],a[501][501],i,j,h,k,n,s;
long long mi;
int main()
{
    freopen("podm.in","r",stdin);
    freopen("podm.out","w",stdout);
    scanf("%d",&n);
    for(i=0;i<=n;i++)
        scanf("%d",&d[i]);
    for(h=2;h<=n;h++)
        for(i=1;i<=n-h+1;i++)
        {
            j=i+h-1;
            mi=999999999999999;
            for(k=i;k<j;k++)
            {
                s=a[i][k]+a[k+1][j]+d[i-1]*d[k]*d[j];
                if(s<mi)
                    mi=s;
                a[i][j]=mi;
            }
        }
    printf("%d",a[1][n]);
    return 0;
}