#include <unistd.h>
#include <stdio.h>
#include <sys/wait.h>
#include <stdlib.h>

enum
{
    AMOUNT_OF_CHILDREN = 3,
    STRING_SIZE = 8,
    INTEGER_BASE = 10
};

void
support(int cond)
{
    char string[STRING_SIZE];
    if (read(0, string, sizeof(string)) !=sizeof(string)) {
        _exit(1);
    }
    int num = strtol(string, 0, INTEGER_BASE);
    printf("%d %d\n", cond, num * num);
    fflush(stdout);
}

int
main(void)
{
    pid_t ppid, pid;
    pid_t arr[AMOUNT_OF_CHILDREN] = {0};
    ppid = getpid();

    for (int i = 0; i < AMOUNT_OF_CHILDREN; ++i) {
        if (getpid() == ppid) {
            pid = fork();
            if (pid == 0) {
                arr[i] = getpid();
            }
        }
    }

    if (getpid() == ppid) {
        while (wait(NULL) > 0) {}
        _exit(0);
    } else {
        for (int i = 1; i <= AMOUNT_OF_CHILDREN; ++i) {
            if (getpid() == arr[i-1]) {
                support(i);
            }
        }
    }

    return 0;
}