#include<stdio.h>
#include <stdlib.h>
int main()
 { 
    int n,i,j,cnt1=0,cnt2=0,cnt3=0,ans,max;
    char s[100];
    scanf("%d",&n);
    for(i=0;i<=n;i++)
     {
      scanf("%c",&s[i]);
     }
    for(i=0;i<=n-1;i++)
     {
      if(s[i]=='V'&&s[i+1]=='K')
      cnt1++;
     }
     max=cnt1;
    for(i=0;i<n;i++)
    {
     s[i]='V';
      for(j=0;j<n;j++)
       {
       if(s[j]=='V'&&s[j+1]=='K')
       cnt2++;
       if(cnt2>max)
       max=cnt2;
       }
       cnt2=0;      
    }    
    for(i=1;i<n;i++)
    {
     s[i]='K';
      for(j=0;j<n;j++)
       {
       if(s[j]=='V'&&s[j+1]=='K')
       cnt3++;
       if(cnt3>max)
       max=cnt3;     
       }
      cnt3=0;
    }
      printf("%d",max);
   system("PAUSE");
  return 0;
}