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def main():
    no_tests = int(input())
    results = input()
    score = 0

    group_len = int(no_tests / 10)

    for i in range(10):
        ptr = i * group_len
        if "N" not in results[ptr:ptr+group_len]:
            score += 1

    print(score)

if __name__ == "__main__":
    main()