#include <stdio.h>

int n, a[100001], x, y, ans, i;

int main() {
    scanf("%d", &n);
    for(i = 0; i < n - 1; ++i) {
        scanf("%d%d", &x, &y);
        a[x-1]++; a[y-1]++;
    }
    for(i = 0; i < n; ++i) {
        if (a[i] > 2)ans += a[i] - 2;
    }
    printf("%d\n", ans);
}