#include <bits/stdc++.h>
#define pb push_back

using namespace std;

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

long long int n, v[503];
long long int dp[502][502];

int main()
{
  fin >> n;
  for (int i = 0; i <= n; i++)
    fin >> v[i];
  for (int i = 1; i <= n; i++)
    dp[i][i] = 0;
  for (int i = 1; i < n; i++)
    dp[i][i + 1] = v[i - 1] * v[i] * v[i + 1];
  for (int d = 2; d < n; d++)
    for (int i = 1; i <= n - d; i++) {
      int j = i + d;
      dp[i][j] = INT_MAX;
      for (int k = i; k < j; k++)
        dp[i][j] = min(dp[i][j], dp[i][k] + dp[k + 1][j] + v[i - 1] * v[k] * v[j]);
    }
  fout << dp[1][n];
  return 0;
}