#15 #29 #35 #37 #49 #50 WA

#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' and s[i+1]=='K')
		{
			ans++;
			i++;
			s[i]=='n';
			s[i+1]=='n';
		}
	}
	for(int i=0;i<n;i++)
	{
		if(s[i]==s[i+1] and s[i]!='n')
		{
			ans++;
			break;
		}
	}
	cout<<ans;
    return 0;
}