#include <fstream>
#define int long long
using namespace std;
int v[505], dp[505][505];
signed main()
{
    ifstream cin("podm.in");
    ofstream cout("podm.out");
    int n;
    cin >> n;
    for(int i = 1; i <= n+1; i++){
        cin >> v[i];
    }
    for(int i = 1; i <= n; i++){
        dp[i][i + 1] = v[i] * v[i + 1] * v[i + 2];
    }
    for(int i = 3; i <= n; i++){
        int l = 1, c = i, mn;
        while(c <= n){
            mn = v[l] * v[l + 1] * v[c + 1] + dp[l + 1][c];
            for(int k = l + 1; k < c; k++){
                mn = min(mn, v[l] * v[k + 1] * v[c + 1] + dp[l][k] + dp[k + 1][c]);
            }
            dp[l][c] = mn;
            l++;
            c++;
        }
    }
    cout << dp[1][n];
    return 0;
}