#include <arpa/inet.h>
#include <cstdio>
#include <netdb.h>
int main(int c, char **v) {
    const char * addrAsText = c < 2 ? "pool.ntp.org" : v[1];
    hostent *ret = gethostbyname(addrAsText);
    if (!ret) { herror("gethostbyname failed"); return 1; }
    for (int i = 0; ret->h_addr_list[i]; ++i) {
        in_addr *addrAsInt = (in_addr *)ret->h_addr_list[i];
        puts(inet_ntoa(*addrAsInt));
    }
    return 0;
}