Distinct numbers in an array (with negative numbers)

/*  BISMILLAHIR-RAHMANIR-RAHIM
 ____________________________________
|                                    |
|       SHANTO_SUST_SWE-19_029       |
|____________________________________|
*/

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
#include <time.h>

#define debug 1

int number[2000005];

int main()
{
    int n;
    scanf("%d", &n);
    int ara[n];
    int i, max = -1000005;

    for(i = 0; i < n; i++){
        scanf("%d", &ara[i]);
        number[ara[i] + 1000001]++;
        if(ara[i] > max){
            max = ara[i];
        }
    }

    int count = 0;

    for(i = 0; i <= 1000001 + max; i++){
        if(number[i] > 0){
            count++;
        }
    }

    printf("%d\n", count);


    return 0;
}

//ALHAMDULILLAH