#include #include

using namespace std;

//字符串 string s; int n; int ans;

int calc(string s){ int res = 0; for (int i=0;i<s.length();i++) if (s[i]=='V' && s[i+1] == 'K') res++; return res; }

int main(){ int n; cin >> n >> s; ans = calc(s); string t = s; for (int i=0;i<=s.length();i++){ s[i] = 'V'; ans = max(ans, calc(s)); s[i] = 'K'; ans = max(ans, calc(s)); s[i] = t[i]; }

cout << ans << endl;

}