#include <iostream>
#include <bits/stdc++.h>
#define NMAX 10000
#define INFILE "podm.in"
#define OUTFILE "podm.out"
using namespace std;

ifstream in(INFILE);
ofstream out(OUTFILE);

int P[NMAX];
int m[NMAX][NMAX];
int N(0);

void Read(){
    in>>N;
    N++;
    for(int i=0;i<N;i++)
        in>>P[i];
}

void MinimInmultiri(){

    for(int l=2;l<=N;l++){
        for(int i=1;i<=N-l+1;i++){
            int j=i+l-1;
            m[i][j]=INT_MAX;
            int q(0);
            for(int k=i;k<j;k++){
                q=m[i][k]+m[k+1][j]+P[i-1]*P[k]*P[j];
                if(m[i][j]>q){
                    m[i][j]=q;
                }
            }

        }
    }

}

int main()
{
    Read();
    MinimInmultiri();
    out<<m[1][N-1];
    return 0;
}