#include<iostream>
using namespace std;
int main(){
	int n,sum=0,flag=0;
	char a[10086]={0};
	cin>>n;
	for(int i=1;i<n+1;i++){
		cin>>a[i];
		if(a[i]=='K'&&a[i-1]=='V'){
			sum++;
			a[i]='x';
			a[i-1]='x';
		}else if(((a[i]=='V'&&a[i-1]=='V')||(a[i]=='K'&a[i-1]=='K'))&&flag==0){
			sum++;
			flag=1;
		}
	}
	cout<<sum;
	return 0;
}