#include <iostream>
using namespace std;
int cnt,flag;
int main()
{
	int n;
	cin>>n;
	string s;
	cin>>s;
	for(int i=0;i<n;i++)
	{
		if(s[i+1]=='\0') break;
		if(s[i]=='V'&&s[i+1]=='K')
		{
			cnt++;
			i++;
		}
		if(s[i]=='V'&&s[i+1]!='K'&&flag==0)
		{
			cnt++;
			flag=1;
		}
		if(s[i]=='K'&&s[i+1]=='K'&&flag==0)
		{
			cnt++;
			flag=1;
		}
	}
	cout<<cnt;
}