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#include <bits/stdc++.h>
using namespace std;
int maxN;
/**
* 功能：获取字符串中有多少个VK
*/
int getVkCount(string s) {
int cnt = 0;
for (int i = 0; i < s.size() - 1; i++) //注意这里的-1
if (s[i] == 'V' && s[i + 1] == 'K') cnt++;
return cnt;
}
int main() {
int n;
string s;
cin >> n >> s;
//计算一下原始的VK个数
maxN = getVkCount(s);
//变换
for (int i = 0; i < s.size(); i++) {
string s1 = s;
s1[i] = s1[i] == 'K' ? 'V' : 'K';//该个变换一下，这个三元表达式用的很舒服~
//重新计算最大个数值
maxN = max(maxN, getVkCount(s1));
printf("%d", maxN);
return 0;
