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#!python

n = int(input())
tests_res = input()

res = 0
group_count = n // 10
for p in range(10):
    all_true = True
    for i in range(group_count):
        if tests_res[p*group_count + i] == 'N':
            all_true = False
    if all_true:
        res += 1
print(res)