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

int n,ans;
string s;

int main(){
	cin>>n>>s;
	for(int i=0;i<n;i++){
		if((s[i]=='V'&&s[i+1]=='K')||(s[i]=='K'&&s[i+1]=='V')){
			ans++;
			s[i]='A';
			s[i+1]='A';
		}
	}
	for(int i=0;i<n;i++){
		if(s[i]=='V'&&s[i]+1=='V'){
			ans++;
			break;
		}
		if(s[i]=='K'&&s[i+1]=='K'){
			ans++;
			break;
		}
	}
	cout<<ans;
}