#include <bits/stdc++.h>

using i32 = std::int32_t;
using u32 = std::uint32_t;
using i64 = std::int64_t;
using u64 = std::uint64_t;
using i128 = __int128_t;
using u128 = __uint128_t;
using isize = std::ptrdiff_t;
using usize = std::size_t;

class rep {
    struct Iter {
        usize itr;
        constexpr Iter(const usize pos) noexcept : itr(pos) {}
        constexpr void operator++() noexcept { ++itr; }
        constexpr bool operator!=(const Iter& other) const noexcept { return itr != other.itr; }
        constexpr usize operator*() const noexcept { return itr; }
    };
    const Iter first, last;

  public:
    explicit constexpr rep(const usize first, const usize last) noexcept : first(first), last(std::max(first, last)) {}
    constexpr Iter begin() const noexcept { return first; }
    constexpr Iter end() const noexcept { return last; }
};

template <class F> struct RecursiveLambda : private F {
    explicit constexpr RecursiveLambda(F&& f) : F(std::forward<F>(f)) {}
    template <class... Args> constexpr decltype(auto) operator()(Args&&... args) const {
        return F::operator()(*this, std::forward<Args>(args)...);
    }
};

template <class F> constexpr decltype(auto) rec_lambda(F&& f) {
    using G = std::decay_t<F>;
    return RecursiveLambda<G>(std::forward<G>(f));
}

template <class T> using Vec = std::vector<T>;

void main_() {
    usize N;
    std::cin >> N;
    Vec<Vec<usize>> graph(N);
    for (const auto i : rep(1, N)) {
        usize a, b;
        std::cin >> a >> b;
        a -= 1;
        b -= 1;
        graph[a].push_back(b);
        graph[b].push_back(a);
    }
    Vec<std::array<usize, 2>> dp(N);
    rec_lambda([&](auto&& dfs, const usize u, const usize p) -> void {
        dp[u] = {0, 1};
        for (const auto v : graph[u]) {
            if (v != p) {
                dfs(v, u);
                dp[u][0] += dp[v][1];
                dp[u][1] += std::min(dp[v][0], dp[v][1]);
            }
        }
    })(0, 0);
    std::cout << std::min(dp[0][0], dp[0][1]) << '\n';
}

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    main_();
    return 0;
}