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//Andrzej Jabłoński
#include "bits/stdc++.h"
#define forx(i,b,e) for(auto i = (b), ie = (e); i < ie; i++)
#define pow2(x) (1ll<<(x))
#define all(x) begin(x), end(x)
#define until(x) while(!(x))
#define len(x) (int)size(x)

using namespace std;
using llong = long long;

template<class T> void __echo(const T & x, string sep) { cerr << x << sep; }
void __echo(const string& x, string sep) { cerr << "\"" << x << "\"" << sep; }
void __echo(const char& x, string sep = ", ") { cerr << "\'" << x << "\'" << sep; }
template<class T>
void __echo(const vector<T>& x, string sep) {
    cerr << "{";
    for (size_t i = 0; i < x.size(); i++) 
        __echo(x[i], i + 1 == x.size() ? "" : ", ");
    cerr << "}" << sep;
}

template<class T1, class T2>
void __echo(const pair<T1, T2>& x, string sep = ", ") 
{ cerr << "("; __echo(x.first, ", "); __echo(x.second, ""); cerr << ")" << sep; }

void __echo(istringstream& stream) {
    cerr << "\n";
}
template<size_t> struct Int {};
template<class Tuple, size_t Pos> void print_tuple(const Tuple& x, Int<Pos>) {
    __echo(get<tuple_size<Tuple>::value - Pos>(x), ", ");
    print_tuple(x, Int<Pos - 1>());
}
template<class Tuple>
void print_tuple(const Tuple& x, Int<1>) { cerr << get<tuple_size<Tuple>::value - 1>(x); }
template<class... Args>
void print_tuple(const tuple<Args...>& x) { print_tuple(x, Int<sizeof... (Args)>()); }
template<class... Args>
void __echo(const tuple<Args...>& x, string sep) { cerr << "("; print_tuple(x); cerr << ")" << sep; }
template<class T>
bool _char_const(const T& x) { return false; }
bool _char_const(const char* x) { cerr << x; return true; }
template<class T>
bool isCharConst(const T& x) { return false; }
bool isCharConst(const char* x) { return true; }
string trim(string x) {
    return string(begin(x) + x.find_first_not_of(' '), begin(x) + x.find_last_not_of(' ') + 1);
}
template<class T, class... Args>
void __echo(istringstream& stream, const T& x, Args... args) {
    static int cnt[200] = { 0 };//no bo po co to tworzyc od nowa?
    string name;
    do {
        string s;
        getline(stream, s, ',');
        for (auto c : s)
            cnt[(int)c]++;
        name += s + ',';
    } while (not(cnt['('] == cnt[')']
        &&
        cnt['['] == cnt[']']
        &&
        cnt['{'] == cnt['}']
        &&
        cnt['\"'] % 2 == 0
        &&
        cnt['\''] % 2 == 0));
    name.pop_back();//usuwamy ','

    if (!_char_const(x)) {
        cerr << trim(name) << " = ";
        __echo(x, "; ");
    }

    __echo(stream, args...);
}
#define echo(...) if(DBG) {istringstream str(#__VA_ARGS__); __echo(str, __VA_ARGS__); }
/////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////

#define TESTSETS 0
#define DBG 0
constexpr int mod = 998244353;

void solve()
{
    int n; cin >> n;
    string s; cin >> s;
    int wynik = 10;
    for(int i = 0; i < n; i += n/10) {
        forx(j, i, i + n / 10) {
            if (s[j] == 'N') {
                wynik -= 1;
                break;
            }
        }
    }
    cout << wynik << "\n";
}

int main()
{
    ios::sync_with_stdio(0); cin.tie(0);
    int t = 1;
    if (TESTSETS)
        cin >> t;

    while (t--)
        solve();
}