#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
#include <algorithm>
#define nmax 500
using namespace std;
FILE *fin,*fout;
int n;
long long m[nmax+2][nmax+2],d[nmax+2];
int main()
{
    fin=fopen("podm.in","r");
    fout=fopen("podm.out","w");
    fscanf(fin,"%d",&n);
    for(int i=0;i<=n;i++)
        fscanf(fin,"%d",&d[i]);
    for(int i=1;i<=n;i++)
        m[i][i]=0;
    for(int i=1;i<=n-1;i++)
        m[i][i+1]=d[i-1]*d[i]*d[i+1];
    for(int i=2;i<=n-1;i++)
        for(int j=1;j<=n-i;j++)
    {
        int k=i+j;
        m[j][k]=LONG_MAX;
        for(int l=j;l<=k-1;l++)
            m[j][k]=min(m[j][k],m[j][l]+m[l+1][k]+d[j-1]*d[l]*d[k]);
    }
    fprintf(fout,"%lld",m[1][n]);
    fclose(fin);
    fclose(fout);
    return 0;
}