#include <bits/stdc++.h>

using namespace std;

#define int long long int

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

int dp[505][505],cc;

signed main() {
    int n;
    fin >> n;
    vector<pair<int,int>> v(n+1);
    for (int i=0; i<=n; i++) {
        int c;
        fin >> c;
        if (i) {
            v[i].second=c;
            v[i].first=cc;
        }cc = c;
    }
    for (int lg = 2; lg <= n; lg++) {
        for (int i=1; i <= n-lg+1; i++) {
            int j = i + lg - 1;
            dp[i][j] = INT_MAX;
            for (int p=i+1; p <= j; p++) {
                dp[i][j] = min(dp[i][j],dp[i][p-1]+dp[p][j]+v[i].first*v[p].first*v[j].second);
            }
        }
    }
    fout << dp[1][n];
    return 0;
}