#include <iostream>
#include <fstream>
#define MAXN 503
#define INF 30000

using namespace std;

ifstream fin("podm.in");
ofstream fout("podm.out");

long long n, a[MAXN], dp[MAXN][MAXN];

int main()
{
    fin >> n;
    for(int i = 0; i <= n; i++) fin >> a[i];
    for(int q = 1; q < n; q++)
    {
        for(int i = 1; i+q <= n; i++)
        {
            int j = i+q;
            dp[i][j] = dp[i][i] + dp[i+1][j] + a[i-1]*a[j]*a[i];
            for(int k = i; k < j; k++)
                dp[i][j] = min(dp[i][j], dp[i][k] + dp[k+1][j] + a[i-1]*a[k]*a[j]);
        }
    }
    fout << dp[1][n];
    return 0;
}