#include <bits/stdc++.h>
using namespace std;
string s; 
int main()
{
	int n;
	cin>>n;
	cin>>s;
	int cnt=0;
	bool flag=1;
	for(int i=0;i<s.size()-1;i++)
		if(s[i]=='V'&&s[i+1]=='K')
			cnt++,i++;
		else if(s[i]=='V'&&s[i+1]=='V'&&flag)
			cnt++,i++,flag=0;
		else if(s[i]=='K'&&s[i+1]=='K'&&flag)
			cnt++,i++,flag=0;
	cout<<cnt;
	return 0;
}//码风较怪，多多谅解