#include<fstream>
using namespace std;
ifstream fi("podm.in");
ofstream fo("podm.out");
long long n,l,L[505],C[505],i,j,k,Dp[505][505];
int main()
{
    fi>>n;
    fi>>l;
    for(i=1; i<=n; i++)
    {
        fi>>C[i];
        L[i]=l;
        l=C[i];
    }
    for(i=n-1; i>=1; i--)
        for(j=i+1; j<=n; j++)
        {
            Dp[i][j]=1000000000000000000LL;
            for(k=i; k<j; k++)
                Dp[i][j]=min(Dp[i][j],Dp[i][k]+Dp[k+1][j]+L[i]*C[k]*C[j]);
        }
    fo<<Dp[1][n]<<"\n";
    fi.close();
    fo.close();
    return 0;
}