#include<bits/stdc++.h>
using namespace std;

int main(){
	int len, ans = 0;
	string s;
	cin >> len >> s;
	bool b[len];
	for (int i = 0; i < len; i++){
		if (i <= len-2 && s[i] == 'V' && s[i+1] == 'K'){
			b[i] = b[i+1] = 1;
			ans++;
		}
	}
	for (int i = 0; i < len; i++){
		if (i <= len-2 && b[i] == 0 && b[i+1] == 0){
			ans++;
			break;
		}
	}
	cout << ans;
}