#include<iostream>
#include<cstring>
using namespace std;
string s;
long long n;
long long cnt=0;
int main()
{
	cin>>n;
	cin>>s;
	for(int i=1;i<=n;i++)
	{
		if(s[i]=='V'&&s[i+1]=='K') cnt++;
		else if(s[i-1]=='V'&&s[i]=='K') cnt++;
	}
	cout<<cnt<<endl; 
	return 0;
}