n = int(input()) #输入整数

s = list(input())#输入字符串 因为后面会修改里面的东西 所以前面加list

c=d=0

for i in range(n-1):

	if(s[i]=='V' and s[i+1]=='K'):
    		s[i]=s[i+1]='X'#满足条件以后把这两个数变为XX 后面循环就不冲突了
    		c+=1

for i in range(n-1):

	if((s[i]=='V' and s[i+1]=='V') or (s[i]=='K' and s[i+1]=='K')):
    		d=1#d来判断有没有替换过字母 有后面加1

if(d):

	  print(c+1)

else:

	  print(c)