#include <stdio.h>

int max(int number) {
    if (number > 0)  
        return number;
    else
        return 0; 
}

int main(void){
    
    int i;
    int N;
    int valency[100001] = {0};
    
    scanf("%d", &N);
    
    for (i=1; i<=2*N-2; i++) {
        int read;
        scanf("%d", &read);
        valency[read]++;
    }
    
    int ans = 0;
    for (i=1; i<=N; i++){
        ans += max(valency[i] - 2);
    }
    
    printf("%d\n", ans);
    
    return 0;
}