#include <bits/stdc++.h>
#define InFile "podm.in"
#define OutFile "podm.out"
#define DMAX 505

using namespace std;

FILE *fin=fopen(InFile,"r");
FILE *fout=fopen(OutFile,"w");

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

void citire();
void pd();
void afisare();

int main()
{citire();
 pd();
 afisare();
 return 0;
}
void citire()
{int i;
 fscanf(fin,"%d",&n);
 for(i=0;i<=n;i++)
     fscanf(fin,"%d",&d[i]);
}
void pd()
{int i,nr,j,k;
 long long int minim;
 ///initializare pentru 2 matrice
 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 secv 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()
{fprintf(fout,"%d",cmin[1][n]);

}