#include <iostream>
#include <fstream>
using namespace std;

const char iname[] = "podm.in";
const char oname[] = "podm.out";

#define MAXN  505
#define Min(a, b) ((a) < (b) ? (a) : (b))
#define INF   100000000000000000LL

long long int bst[MAXN][MAXN], d[MAXN];   int n;

int main(void)
{
    FILE * f1 = fopen (iname,"r");
    FILE * f2 = fopen (oname,"w");
    int i;
    fscanf(f1,"%d",&n);
    for (i=0 ;i<=n ;i++){
        fscanf(f1,"%I64d",&d[i]);
    }
    for (i=1 ;i <=n ;i++) bst[i][i]=0;
    for (i=1 ; i <= n-1 ;i++){
        bst[i][i+1]= d[i-1]*d[i]*d[i+1];
    }
    int w,k,j;
    for (w=2; w<=n-1;w++)
    {
        for(i=1; i<= n-w ;i++)
        {
        j=w+i;
        bst[i][j]=INF;
        for (k=i ;k<=j-1;k++)
            {
            bst[i][j]=Min(bst[i][j],bst[i][k]+bst[k+1][j]+d[i-1]*d[k]*d[j]);
            }

        }
    }
    fprintf(f2,"%I64d\n",bst[1][n]);
    fclose(f1);
    fclose(f2);
}