#include<stdio.h>
unsigned long long a[501][501],m;
int dim[501],i,n,j,d,k,v[501];

int main()
{freopen("podm.in","r",stdin);
freopen("podm.out","w",stdout);
scanf("%d\n",&n);
for(i=0;i<=n;i++)
       scanf("%d",&dim[i]);
for(i=1;i<=n;i++)
       a[i][i]=0;
for(i=1;i<=n-1;i++)
       a[i][i+1]=dim[i-1]*dim[i]*dim[i+1];
for(d=2;d<n;d++)
       {for(i=1;i<=n-d;i++)
               {v[1]=1;
               a[i][i+d]=0;
               for(i=2;i<=12;i++)
                        v[i]=0;
               for(i=1;i<=12;i++)
                        a[i][i+d]=a[i][i+d]*10+v[i];
               for(k=i;k<i+d;k++)
                        {m=a[i][k]+a[k+1][i+d]+dim[i-1]*dim[k]*dim[i+d];
                        if(a[i][i+d]>m)
                                 a[i][i+d]=m;}}}
printf("%llu\n",a[1][n]);
fclose(stdin);
fclose(stdout);
return 0;}