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import sys

def solve(input):
    score = 0
    k = len(input) // 10
    for i in range(0, len(input), k):
        gr = input[i:i+k]
        if 'N' not in gr:
            score += 1
    return score

sys.stdin.readline()
input = sys.stdin.readline().strip()
print(solve(input))