#include <iostream>
#include <fstream>
#include <climits>
#define NMAX 505
using namespace std;
ifstream f("podm.in");
ofstream g("podm.out");
long long d[NMAX],n,c[NMAX][NMAX];
int main(){
    f>>n;
    int i,l,k;
    for(i=0;i<=n;i++)
        f>>d[i];
    for(i=1;i<=n;i++)
        c[i][i]=0;
    for(l=1;l<=n-1;l++) //distanta fata de diagonala principala
        for(i=1;i<=n-l;i++){
            c[i][i+l]=LLONG_MAX;
            for(k=i;k<i+l;k++){
                if(c[i][i+l]>c[i][k]+c[k+1][i+l]+d[i-1]*d[k]*d[i+l])
                    c[i][i+l]=c[i][k]+c[k+1][i+l]+d[i-1]*d[k]*d[i+l];
            }
        }
    g<<c[1][n]<<'\n';
    return 0;
}