#include <stdio.h>
#include <stdlib.h>

int *getfactors(int n) {
    int i = 2, k = 0;
    int *factors = malloc(100*sizeof(int));
    while (i < n) {
        while ((n % i) == 0) {
            n = n/i;
            factors[k++] = i;
        }
        i++;
    }
    return factors;
}

int main(int argc, char *argv[]) {
    int *factors = malloc(100*sizeof(int));
    int i = 0;
    factors = getfactors(600851475143);
    while (factors[i] != 0)
        printf ("%d, ", factors[i++]);
    printf("\n");
    return 0;
}