#include <bits/stdc++.h>
using namespace std;
int main(){
int a=0;
bool as=true;
int sa;
string s;
cin>>sa;
for(int i=1;i<=sa;i++){
	cin>>s[i];
}
int n=s.size();
for(int i=1;i<=n;i++){
	if(s[i]=='v'&&s[i+1]=='k') a++;
	if((s[i]=='v'&&s[i+1]=='v')||(s[i]=='k'&&s[i+1]=='k')) as=false;
}
if(as==false){
	cout<<a+1;
	return 0;
}
cout<<a;
	return 0;
}