#include<iostream>
#include<cstring>
#include<string>
using namespace std;
int main()
{	
	int a,sum=0,c=1;
	string s;
	cin>>a>>s;
	for(int i=0;i<a;i++)
	{
		if(s[i]=='V'&&s[i+1]=='K')
		{
			sum++;
			i++;	
		}
		if(c!=0&&i<a-1&&s[i])
		{
			if(s[i]=='V'&&s[i+1]!='K') 
			{
				c--;
				sum++;
			}
			if(s[i]=='K'&&s[i-1]!='V') 
			{
				c--;
				sum++;
			}
		}
	}
	cout<<sum;
	return 0;
}

84分，球球大佬看看哪里错了