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#include <bits/stdc++.h>

#define IN(x) int x; scanf("%d", &x)
#define OUT(x) printf("%d\n", x)
#define FRN(ii, ll, uu) for(int ii = (ll); ii < uu; ++ii)
#define FOR(ii, nn) FRN(ii, 0, nn)
#define LI long long
#define LIN(x) LI x; scanf("%lld", &x)
#define LOUT(x) printf("%lld\n", x)
#define GETS(s) scanf(" %s", s)
// 2**62-1, won't overflow if doubled
#define LINF 4611686018427387903LL
#define BYTE unsigned char



/// END OF BOILERPLATE ;)

using namespace std;

int main() {
    int n;
    string s;
    cin >> n >> s;
    int T = n / 10;
    int sp = 0;
    // cout << s << " " << T << endl;
    for (int np=0; np < 10; ++np)
    {
        int pt = 1;
        for (int nt=0; nt < T; ++nt)
        {
            int pos = np*T+nt;

            // cout << pos << s[pos] << endl;
            if (s[pos] == 'N')
            {
                pt = 0;
                break;
            }
        }
        sp += pt;
        // cout << endl;
    }
    cout << sp << endl;
    return 0;
}