#include <iostream>
#include <string>
using namespace std;

int n;
string s;
int sum=0;
int opportunity=1;
int main()
{
    cin>>n>>s;
    for(int i=0;i<n;i++)
    {
    	if(s[i]=='V' and s[i+1]=='K')sum++;
    	else if(opportunity == 1 and s[i]=='V' and s[i+2]!='K' and i+1!=n)
    	{
    		opportunity=0;
    		sum++;
		}
	}
	cout<<sum;
    return 0;
}