#include <bits/stdc++.h>
using namespace std;
const int MAX = 1e5 + 5;
const int LIM = 3e5 + 5;
const int MOD = 1e9 + 7;
const long double EPS = 1e-10;
const double PI = acos(-1.0);
double tick() {
  static clock_t oldt, newt = clock();
  double diff = 1.0 * (newt - oldt) / CLOCKS_PER_SEC;
  oldt = newt;
  return diff;
}
template <typename T>
void inpos(T &x) {
  x = 0;
  register T c = getchar();
  while (((c < 48) || (c > 57)) && (c != '-')) c = getchar();
  bool neg = 0;
  if (c == '-') neg = 1;
  for (; c < 48 || c > 57; c = getchar())
    ;
  for (; c > 47 && c < 58; c = getchar()) x = (x << 3) + (x << 1) + (c & 15);
  if (neg) x = -x;
}
template <typename T>
void outpos(T n) {
  if (n < 0) {
    putchar('-');
    n *= -1;
  }
  char snum[65];
  int i = 0;
  do {
    snum[i++] = n % 10 + '0';
    n /= 10;
  } while (n);
  i = i - 1;
  while (i >= 0) putchar(snum[i--]);
  putchar('\n');
}
inline void instr(char *str) {
  register char c = 0;
  register int i = 0;
  while (c < 33) c = getchar();
  while (c != '\n' && c != ' ' && c != EOF) {
    str[i] = c;
    c = getchar();
    ++i;
  }
  str[i] = '\0';
}
template <typename T>
T gcd(T a, T b) {
  return (b ? __gcd(a, b) : a);
}
template <typename T>
T lcm(T a, T b) {
  return (a * (b / gcd(a, b)));
}
int add(int a, int b, int c) {
  int res = a + b;
  return (res >= c ? res - c : res);
}
int mod_neg(int a, int b, int c) {
  int res;
  if (abs(a - b) < c)
    res = a - b;
  else
    res = (a - b) % c;
  return (res < 0 ? res + c : res);
}
int mul(int a, int b, int c) {
  long long res = (long long)a * b;
  return (res >= c ? res % c : res);
}
long long mulmod(long long a, long long b, long long m) {
  long long q = (long long)(((long double)a * (long double)b) / (long double)m);
  long long r = a * b - q * m;
  if (r > m) r %= m;
  if (r < 0) r += m;
  return r;
}
template <typename T>
T expo(T e, T n) {
  T x = 1, p = e;
  while (n) {
    if (n & 1) x = x * p;
    p = p * p;
    n >>= 1;
  }
  return x;
}
template <typename T>
T power(T e, T n, T m) {
  T x = 1, p = e;
  while (n) {
    if (n & 1) x = mul(x, p, m);
    p = mul(p, p, m);
    n >>= 1;
  }
  return x;
}
template <typename T>
T extended_euclid(T a, T b, T &x, T &y) {
  T xx = 0, yy = 1;
  y = 0;
  x = 1;
  while (b) {
    T q = a / b, t = b;
    b = a % b;
    a = t;
    t = xx;
    xx = x - q * xx;
    x = t;
    t = yy;
    yy = y - q * yy;
    y = t;
  }
  return a;
}
template <typename T>
T mod_inverse(T a, T n) {
  T x, y, z = 0;
  T d = extended_euclid(a, n, x, y);
  return (d > 1 ? -1 : mod_neg(x, z, n));
}
const int N = 200 * 1000 + 11;
int p[N];
int d[N];
vector<int> g[N];
void dfs(int v, int pr = -1, int dst = 0) {
  d[v] = dst;
  p[v] = pr;
  for (auto to : g[v]) {
    if (to != pr) {
      dfs(to, v, dst + 1);
    }
  }
}
int main() {
  int n;
  scanf("%d", &n);
  for (int i = 0; i < n - 1; ++i) {
    int x, y;
    scanf("%d %d", &x, &y);
    --x, --y;
    g[x].push_back(y);
    g[y].push_back(x);
  }
  dfs(0);
  set<pair<int, int>> st;
  for (int i = 0; i < n; ++i) {
    if (d[i] > 2) {
      st.insert(make_pair(-d[i], i));
    }
  }
  int ans = 0;
  while (!st.empty()) {
    int v = st.begin()->second;
    v = p[v];
    ++ans;
    auto it = st.find(make_pair(-d[v], v));
    if (it != st.end()) {
      st.erase(it);
    }
    for (auto to : g[v]) {
      auto it = st.find(make_pair(-d[to], to));
      if (it != st.end()) {
        st.erase(it);
      }
    }
  }
  printf("%d\n", ans);
}
