#include<bits/stdc++.h>
using namespace std;
int a,d=1,sum;
string s;
int main(){
	cin>>a>>s;
	for(int i=0;i<a;i++){
		if(s[i]=='V' and s[i+1]=='K'){
			sum+=1;
			s[i]='x';
			s[i+1]='x';
		}
	}
	for(int i=0;i<a;i++){
		if(s[i]=='V' and d==1 and s[i+1]){
			sum+=1;
			d=0;
		}
	}
	for(int i=0;i<a;i++){
		if(s[i+1]=='k' and d==1 and s[i-1]){
			sum+=1;
			d=0;
		}
	}
	cout<<sum;
}