"""
[25193: 곰곰이의 식단 관리](https://www.acmicpc.net/problem/25193)
Tier: ??
Category: 구현, 그리디
"""
def solution():
n = int(input())
s = input()
c = s.count('C')
a = n - c + 1
return c // a + (1 if c % a else 0)
if __name__ == '__main__':
print(solution())