#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    string a;
    cin>>a;
    int s=0;
    for(int i=0;i<n;i++){
        if(a[i]=='V'&&a[i+1]=='K') s++;
    }
    string b=a;
    for(int i=0;i<n;i++){
        if(b[i]=='V') b[i]='K';
        else b[i]='K';
        int s1=0;
        for(int j=0;j<n;j++){
            if(b[j]=='V'&&b[j+1]=='K') s1++;
        }
        if(s1>s) s=s1;
        b=a;
    }
    cout<<s;
    return 0;
}