markdown

#include<cstdio>
int a[100],ans ;
int main()
{
    int n , t = 0 ;
    while (scanf("%d",&n)!=EOF) {
       for (int i=1; i<=n; ++i) scanf("%d",a+i);
       ans = 0 ; 
       for (int i=1; i<=n ; ++i) if (a[i]!=a[i-1]) ++ans ; 
       ans = ans /3 + ( ans % 3>0)  ; 
       ++t ; 
       printf("Case %d: %d
",t,ans) ; 
    }
}