#include<iostream>
#include<string>

using namespace std;
int main()
{
	int n, sum = 0;
	cin >> n;
	char a[105];
	cin >> a;
	int len = strlen(a);
	for (int i = 0; i < len; i++)
	{
		if (a[i] == 'V'&&a[i + 1] == 'K')sum++;
	}
	for (int j = 0; j < len; j++)
	{
		if ((a[j] == 'V'&&a[j + 1] == 'V'&&a[j + 2] == 'V') || (a[j] == 'K'&&a[j + 1] == 'K'&&a[j + 2] == 'K'))
		{
			sum++;
			break;
		}
	}
	cout << sum;
	return 0;
}