arc

#include <fstream>
using namespace std;

ifstream f("arc.in");
ofstream g("arc.out");

void cer1()
{
    long n,aux,x,i,nrs=1;
    f>>n>>aux;
    for (i=1;i<n;i++)
    {
        f>>x;
        if (x!=aux)
            nrs++;
        aux=x;
    }
    g<<nrs;
}

void cer2 ()
{



}

int main()
{

short p;
f>>p;
if (p==1)
  cer1();
  else
    cer2();

return 0;
}