#include <stdio.h>
#include <string.h>

void main(void){
    int n = 0;
    scanf("%d",&n);
    int numList[n] = {};
    for(int i = 0 ; i < n ; i++){
        long long int num = 0 ;
        scanf("%lld",&num);
        numList[num-1]++;
    }
    int count = 0;
    for(long long int i = 0 ; i < n ; i++){
        if(numList[i] == 1){
            count++;
        }
    }
    printf("%d",count);
}