fn main(){
  let n: usize = read();
  let mut adl: Vec<Vec<usize>> = vec![Vec::new();n+1];

  for _ in 1 .. n {
    let ab: Vec<usize> = read_vec();
    let a = ab[0];
    let b = ab[1];
    adl[a].push(b);
    adl[b].push(a);
  }

  let mut ans: usize = 0;

  for i in 1 .. n+1 {
    if adl[i].len() > 2 {
      ans += adl[i].len() - 2;
    }
  }

  println!("{}", ans);
}

fn read<T>() -> T
  where T: std::str::FromStr,
        T::Err: std::fmt::Debug
{
  let mut buf = String::new();
  std::io::stdin().read_line(&mut buf).expect("failed to read");
  buf.trim().parse().unwrap()
}

fn read_vec<T>() -> Vec<T>
  where T: std::str::FromStr,
        T::Err: std::fmt::Debug
{
  let mut buf = String::new();
  std::io::stdin().read_line(&mut buf).expect("failed to read");
  buf.split_whitespace().map(|e| e.parse().unwrap()).collect()
}