#include <bits/stdc++.h>

using namespace std;
ifstream fin("podm.in");
ofstream fout("podm.out");
int n, d[10005], i, x, k;
unsigned long long int val;
unsigned long long int M[505][505];
int main()
{
    fin>>n;
    for(i=0;i<=n;++i)
        fin>>d[i];
    for(i=1;i<n;++i)
        M[i][i+1]=d[i-1]*d[i]*d[i+1];
    for(x=2;x<n;++x)
    {
        for(i=1;i<=n-x;++i)
        {
            M[i][i+x]=200000000000000000;
            for(k=i;k<i+x;++k)
            {
                val=M[i][k]+M[k+1][i+x]+d[i-1]*d[k]*d[i+x];
                M[i][i+x]=min(M[i][i+x], val);
            }
        }
    }
    fout<<M[1][n]<<'\n';
    return 0;
}