#define _CRT_SECURE_NO_WARNINGS	
#include<stdio.h>
#include<stdlib.h>
#include<ctype.h>
#include<string.h>
#include<math.h>
#include<string>
#include <iostream>
#include<cstring>
using namespace std;
int main()
{
	int n;
	cin >> n;//给出一个数字n 代表字符串的长度
	getchar();//吃掉回车
	string str;//给出一个字符串s
	getline(cin, str);
	int count = 0;
	//cout << str.length() << endl;
	for (int i = 0; i < str.length(); i++)
	{
		if (str[i] == 'V' && str[i + 1] == 'K')
		{
			count++;
			str[i] = 'X';
			str[i + 1] = 'X';
		}
	}
	for (int i = 0; i < str.length(); i++)
	{
		if (str[i] != 'X' && str[i + 1] == str[i])
		{
			count++;
			break;
		}
	}
	cout << count << endl;
	return 0;
}