n=int(input())
s=input().rstrip()
cnt=s.count('VK')
for i in range(n):
    if s[i:i+2]=='VV' or s[i:i+2]=='KK':
        s=s[:i]+'VK'+s[i+2:]
    if cnt<s.count('VK'):
        cnt=s.count('VK')
        break
print(cnt)