import sys
readline = sys.stdin.readline

def non_rec_dfs(s):
    stack = []
    stack.append(~s)
    stack.append(s)
    color = [0] * N
    par = [-1] * N
    while stack:
        u = stack.pop()
        if u >= 0:
            stack.append(~u)
            for v in G[u]:
                if v == par[u]:
                    continue
                par[v] = u
                stack.append(v)
        else:
            u = ~u
            if par[u] != -1:
                if color[u] + color[par[u]] == 0:
                    color[par[u]] = 1
    return color


N = int(readline())
G = [[] for i in range(N)]
for i in range(N - 1):
    u, v = map(int, readline().split())
    u, v = u - 1, v - 1
    G[u].append(v)
    G[v].append(u)
    
print(sum(non_rec_dfs(0)))