#include <bits/stdc++.h>

using namespace std;

int v[505];
long long dp[505][505];

int main()
{
    ifstream fin("podm.in");
    ofstream fout("podm.out");
    int n;
    fin >> n;
    for(int i = 0; i <= n; ++i)
        fin >> v[i];
    for(int i = 1; i <= n - 1; ++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){
            dp[i][i + d] = 1e18;
            for(int k = i; k <= i + d; ++k)
                dp[i][i + d] = min(dp[i][i + d], dp[i][k] + dp[k + 1][i + d] + 1LL * v[i - 1] * v[k] * v[i + d]);
        }
    }
    fout << dp[1][n];
    return 0;
}