#include <bits/stdc++.h>
#define NMAX 510
#define INF 9999999999999
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
long long int m[NMAX][NMAX];
long long int d[NMAX];
int n;
void citire();
int main()
{citire();

    return 0;
}
void citire()
{int dr,i,k;
 fin>>n;
 for(i=0;i<=n;i++)
         fin>>d[i];
 for(i=1;i<n;i++)
      m[i][i+1]=d[i-1]*d[i]*d[i+1];
 for(dr=2;dr<n;dr++)///fiecare lg posibil
     for(i=1;i+dr<=n;i++)// de la i la i+dr
        {
        long long int minim=INF;
        for(k=i;k<i+dr;k++)
             minim=min(minim,m[i][k]+ m[k+1][i+dr] +d[i-1]* d[k]*d[i+dr]     );
         m[i][i+dr]=minim;
        }
 fout<<m[1][n];
}