#include<iostream>
#include<cstdio>
using namespace std;

int main()
{
	int n;
	string s;
	cin >> n;
	cin >> s;
	int sum = 0, f = 0;
	for(int i = 0;i < n-1;i++)
	{
		if(s[i] == 'V' && s[i+1] == 'K')sum++;
		if(s[i] == 'V' && s[i+1] == 'V')f = 1;
		if(s[i] == 'K' && s[i+1] == 'K')f = 1;
	} 
	cout << sum + f;
	return 0;
}