#include<iostream>
#include<map>
#include<string.h>
using namespace std;
int main()
{
	int n=0;
	cin>>n;
	char str[101]={0};
	for(int i=0;i<n;i++)
	{
		cin>>str[i];
	}
	int m=0;
	for(int i=0;i<n-1;i++)
	{
		if(i<n-2)
		{
			if(str[i]=='V' && str[i+1]=='V' && str[i+2]=='V')
			{
				str[i+1]='K';
				break;
			}
			else if(str[i]=='K' && str[i+1]=='K' && str[i+2]=='K')
			{
				str[i+1]='V';
				break;
			}
		}
		else if(i==n-2)
		{
			if(str[i]=='V' && str[i+1]=='V')
			{
				str[i+1]='K';
				break;
			}
			else if(str[i]=='K' && str[i+1]=='K')
			{
				str[i]='V';
				break;
			}
		}
	}
	for(int i=0;i<n-1;i++)
	{
		if((str[i]=='V' && str[i+1]=='K'))
			m++;
	}
	cout<<m;
}