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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;

    const int group = length / 10;

    std::string text;
    text.reserve(length+5);

    cin >> text;

    int answer = 0;

    for (int idx = 0; idx < length;)
    {
        bool ok = true;

        for (int i = 0; i < group; ++idx, ++i)
        {
            if (text[idx] == 'N')
            {
                ok = false;
            }
        }

        if (ok)
        {
            answer += 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;
}