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/*** includes / typedefs / constans ***/

#include <algorithm>
#include <cstdint>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <cstdio>
#include <cstdlib>
#include <string>
#include <vector>
#include <initializer_list>

using std::initializer_list;
using std::make_pair;
using std::map;
using std::multiset;
using std::pair;
using std::priority_queue;
using std::reverse;
using std::set;
using std::sort;
using std::string;
using std::swap;
using std::vector;

typedef int8_t     int8;
typedef int16_t    int16;
typedef int32_t    int32;
typedef int64_t    int64;
typedef __int128_t int128;

const int32 oo = 1e9;
const int64 ooo = 1e18;

/*** Input / Output Section ***/

#define scan(args...) [&]{ return scanf(args); }();

inline void read(int32& val)
{
    scan("%d", &val);
}

inline void read(int64& val)
{
    scan("%ld", &val);
}

inline void read(double& val)
{
    scan("%lf", &val);
}

inline void read(string& val, int length = 1e6)
{
    char tmp[length+1];

    scan("%s", tmp);

    val = tmp;
}

template <class S, class T>
inline void read(S& a, T& b)
{
    read(a);
    read(b);
}

template <class S>
inline void read(vector<S> &v, int n)
{
    v.resize(n);
    for (int i = 0; i < n; i++)
        read(v[i]);
}

template <class S, class T, class U>
inline void read(S& a, T& b, U& c)
{
    read(a);
    read(b);
    read(c);
}

template <class S, class T, class U, class V>
inline void read(S& a, T& b, U& c, V& d)
{
    read(a);
    read(b);
    read(c);
    read(d);
}

template <class S, class T, class U, class V, class W>
inline void read(S& a, T& b, U& c, V& d, W& e)
{
    read(a);
    read(b);
    read(c);
    read(d);
    read(e);
}

inline void write(int32 val)
{
    printf("%d ", val);
}

inline void write(int64 val)
{
    printf("%ld ", val);
}

inline void write(double val)
{
    printf("%lf ", val);
}

inline void write(const string& val)
{
    printf("%s ", val.c_str());
}

template<class S>
inline void write(const vector<S>& val)
{
    for (S el : val)
        write(el);
}

template<class S>
inline void writeln(const S& a)
{
    write(a);
    printf("\n");
}

template<class S, class T>
inline void writeln(const S& a, const T& b)
{
    write(a);
    write(b);
    printf("\n");
}

template<class S, class T, class U>
inline void writeln(const S& a, const T& b, const U& c)
{
    write(a);
    write(b);
    write(c);
    printf("\n");
}

template<class S, class T, class U, class V>
inline void writeln(const S& a, const T& b, const U& c, const V& d)
{
    write(a);
    write(b);
    write(c);
    write(d);
    printf("\n");
}

template<class S, class T, class U, class V, class W>
inline void writeln(const S& a, const T& b, const U& c, const V& d, const W& e)
{
    write(a);
    write(b);
    write(c);
    write(d);
    write(e);
    printf("\n");
}

/*** code ***/

int n;
string wyniki;

int main()
{
    read(n, wyniki);

    int p = n / 10; // liczba testów w jednej paczce
    vector<int> punkty(10, 1); // 10 punktów (na razie zaliczonych)

    for (int i = 0; i < n; i++)
        if (wyniki[i] == 'N')
            punkty[i / p] = 0;

    int suma_punktow = 0;

    for (int i = 0; i < 10; i++)
        suma_punktow += punkty[i];

    writeln(suma_punktow);

    return 0;
}