#include <bits/stdc++.h>

using namespace std;


template <typename A, typename B>
string to_string(pair<A, B> p);

template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p);

template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p);

string to_string(const string& s)
{
    return '"' + s + '"';
}

string to_string(const char* s)
{
    return to_string((string) s);
}

string to_string(bool b)
{
    return (b ? "true" : "false");
}

string to_string(vector<bool> v)
{
    bool first = true;
    string res = "{";
    for (int i = 0; i < static_cast<int>(v.size()); i++)
    {
        if (!first)
        {
            res += ", ";
        }
        first = false;
        res += to_string(v[i]);
    }
    res += "}";
    return res;
}

template <size_t N>
string to_string(bitset<N> v)
{
    string res = "";
    for (size_t i = 0; i < N; i++)
    {
        res += static_cast<char>('0' + v[i]);
    }
    return res;
}

template <typename A>
string to_string(A v)
{
    bool first = true;
    string res = "{";
    for (const auto &x : v)
    {
        if (!first)
        {
            res += ", ";
        }
        first = false;
        res += to_string(x);
    }
    res += "}";
    return res;
}

template <typename A, typename B>
string to_string(pair<A, B> p)
{
    return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}

template <typename A, typename B, typename C>
string to_string(tuple<A, B, C> p)
{
    return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ")";
}

template <typename A, typename B, typename C, typename D>
string to_string(tuple<A, B, C, D> p)
{
    return "(" + to_string(get<0>(p)) + ", " + to_string(get<1>(p)) + ", " + to_string(get<2>(p)) + ", " + to_string(get<3>(p)) + ")";
}

void debug_out()
{
    cerr << endl;
}

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T)
{
    cerr << " " << to_string(H);
    debug_out(T...);
}

#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

const long long INF = 1e18;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    vector<long long> a(n + 1);
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
    }
    vector<long long> dp1(n + 1, -INF), dp0(n + 1, -INF);

    dp0[1] = a[1];
    dp1[1] = -a[1];
    for (int i = 2; i < n; i++)
    {
        dp0[i] = max(dp0[i - 1] + a[i], dp1[i - 1] - a[i]);
        dp1[i] = max(dp0[i - 1] - a[i], dp1[i - 1] + a[i]);
    }
    long long ans = max(dp0[n - 1] + a[n], dp1[n - 1] - a[n]);
    cout << ans;
    return 0;
}


#include <iostream>
#include <algorithm>

using namespace std;

static const int N = 100;
#define rep(i,a) for(int i = 0 ; i < a ; i ++)
#define loop(i,a,b) for(int i = a ; i < b ; i ++)
int main(void){
	int n,p[N+1],m[N+1][N+1];
	cin>>n;

	loop(i,1,n+1){
		cin>>p[i-1]>>p[i];
	}

	loop(i,1,n+2)m[i][i] = 0;

	loop(l,2,n+1){
		loop(i,1,n-l+2){
			int j = i + l - 1;
			m[i][j] = (1<<21);
			loop(k,i,j){
				m[i][j] = min(m[i][j],m[i][k] + m[k+1][j] + p[i-1]*p[k]*p[j]);
			}
		}
	}
	cout << m[1][n] << endl;
}