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def check_if_correct(T, p, k):
    for i in range(p, k):
        if T[i] == 'N':
            return False
    return True


def count_points(T, n):
    res = 0
    r = n // 10
    for i in range(0, len(T), r):
        if check_if_correct(T, i, i + r):
            res += 1

    return res


n = int(input())
T = input()

print(count_points(T, n))