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#include <bits/stdc++.h>
// #define MULTIPLE_TESTS
// #define ENDLESS_TESTS
#define TIME_LIMIT 1
// #define MEMORY_LIMIT 512

using namespace std;

void test()
{
    int length;
    cin >> length;

    vector<int> data(length);
    for (auto &v : data)
    {
        cin >> v;
    }

    const int INF = 1'000'001;

    auto solve = [&](int comp)
    {
        int answer = 0;
        int prev = comp * INF;

        for (const auto v : data)
        {
            if (comp * prev <= comp * v)
            {
                answer += 1;
                prev = -comp * INF;
            }
            else
            {
                prev = v;
            }

            comp *= -1;
        }

        return answer;
    };

    const int answer = std::min(solve(1), solve(-1));
    cout << answer << endl;
}


int main()
{
#ifndef CONTEST_WORKSPACE
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
#endif

#ifdef ENDLESS_TESTS
    while(!(cin >> std::ws).eof())
        test();
#else
    int T = 0;

#ifdef MULTIPLE_TESTS
    cin >> T;
#else
    T = 1;
#endif

    while (T --> 0)
        test();
#endif

    return 0;
}