#include <bits/stdc++.h>
#define NMAX 510
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");

int n;
long long int d[NMAX];
long long int cmin[NMAX][NMAX];

void citire();
void pd();
void afisare();
int main()
{citire();
 pd();
 afisare();
 return 0;
}
void citire()
{int i;
 fin>>n;
 for(i=0;i<=n;i++)
    fin>>d[i];

}
void pd()
{int i,nr,k,j;
 long long int minim;
 for(i=1;i<n;i++)
    cmin[i][i+1]=d[i-1]*d[i]*d[i+1];
 for(nr=3;nr<=n;nr++)
    //calculez costul pentru toate secventele de nr matrice
     for(i=1;i<=n-nr+1;i++)
        {j=i+nr-1;
         minim=cmin[i+1][j]+d[i-1]*d[i]*d[j];
         for(k=i+1;k<j;k++)
            if(minim>cmin[i][k]+cmin[k+1][j]+d[i-1]*d[k]*d[j])
              minim=cmin[i][k]+cmin[k+1][j]+d[i-1]*d[k]*d[j];
         cmin[i][j]=minim;
        }
}
void afisare()
{fout<<cmin[1][n]<<'\n';

}