#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<stdint.h>
#include<stdbool.h>
#include<tgmath.h>
#include<time.h>
#define ll long long
#define min(a,b) ((a)>(b)?(b):(a))
#define max(a,b) ((a)>(b)?(a):(b))
#define miin(a,b,c) min((a), min((b), (c)))
#define maax(a,b,c) max((a), max((b), (c)))
int n, a[111111] = {};

int cmp(const int *a, const int *b){
    return *a - *b;
}

main(){
    scanf("%d", &n);
    for(int i=1; i<=n; i++){
        scanf("%d", &a[i]);
    }
    int m=n;
    qsort(a+1, n, 4, cmp);
    for(int i=1; i<=n; i++){
        m -= (a[i-1]==a[i] || a[i]==a[i+1]);
    }
    printf("%d\n", m);
    return 0;
}