#include <stdlib.h>
#include <stdio.h> 
int *count(int n){
    
    if (n < 1) return NULL;
    
    int *p = malloc(n * sizeof(int));
    if(p == NULL) return NULL;
    
    while (n != 0){

        *(p + n-1) = n;
        n --;
    }
    return p;
}
/*
int main(){
    int *rslt =  count(5123456);
    int index = 0;

    while(*(rslt + index)){
    
        printf("%i, ", *(rslt + index));
        index ++;
    }
    free(rslt);

}
*/