#include<fstream>
#include<iostream>
#include<queue>
#include<string>
using  namespace std;
fstream in("podm.in",ios::in);
fstream out("podm.out",ios::out);
int v[501];
long long mat[500][500];
int main()
{
    int n;
    in>>n;
    for(int i=0; i<n+1; i++) in>>v[i];
    for(int i=0; i<n; i++) mat[i][i] = 0;
    for(int i=0; i<n-1; i++) mat[i][i+1] = v[i]*v[i+1]*v[i+2];
    for(int i=n-1; i>=0; i--)
        for(int j=i+2; j<n; j++)
        {
            mat[i][j] = -1;
            for(int k=i; k<j; k++)
            {
                long long aux = mat[i][k] + mat[k+1][j] + v[i]*v[k+1]*v[j+1];
                if( mat[i][j] == -1 || mat[i][j] > aux )
                    //  cout << i << j << k << " "<<mat[i][k]<<" "<<mat[k+1][j]<<" "<<v[i]*v[k+2]*v[j+1]<<endl;
                    mat[i][j] = aux;
            }
        }
    out<<mat[0][n-1]<<endl;
	return 0;
}