#include <fstream>
using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");

long long n,d[505],dp[505][505],j,k,i;

int main()
{
    fin>>n;
    for(i=1;i<=n+1;i++) fin>>d[i];

    for(i=1;i<n;i++)
        dp[i][i+1]=d[i]*d[i+1]*d[i+2];

    int xc, yc;

    for(i=3;i<=n;i++)
        {
          xc=1; yc=i;
            while(yc<=n)
            {
                dp[xc][yc]=999999999;
                for(k=xc;k<=yc;k++)
                    dp[xc][yc]=min(dp[xc][yc], dp[xc][k]+dp[k+1][yc]+d[xc]*d[k+1]*d[yc+1]);

            ++xc; ++yc;
            }

        }

    fout<<dp[1][n];

    return 0;
}