#include<bits/stdc++.h>
using namespace std;
int main()
{
long long a,i,b=0,d=1;
string c;
cin>>a;
cin>>c;
for(i=0;i<=a;i++)
{
if(c[i-1]=='V'&&c[i]=='K')b++;
else
{
if(d>0)
{
if(c[i-1]=='V'&&c[i]=='V')
{
b++;
d--;
}
if(c[i-1]=='K'&&c[i]=='K')
{
b++;
d--;
}
}

}
}
cout<<b;
}