#include<iostream>
#include<string.h>
using namespace std;
int n,ans=0,flag=0;
string str;
int main(){
	cin>>n>>str;
	if(n<=1){
		cout<<0;
		return 0;
	}
	for(int i=1;i<n;i++){
		if(str[i]=='K'&&str[i-1]=='V')
		ans++;
		if((str[i]!='K'&&str[i-1]=='V')||(str[i]=='K'&&str[i-1]!='V'))
		flag=1;
	}
	if(flag)
	cout<<ans+1;
	else
	cout<<ans;
}