#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <signal.h>
#include <sys/wait.h>
#include <unistd.h>

struct Message
{
    long type;
    long long x[2];
};

int main(int argc, char *argv[])
{
    struct Message Mess;
    char *eptr;
    key_t key = strtol(argv[1], &eptr, 10);
    int n = strtol(argv[2], &eptr, 10);
    long long maxval = strtol(argv[5], &eptr, 10);
    int msg = msgget(key, 0666 | IPC_CREAT | IPC_EXCL)ж
    pid_t *pid = calloc(n, sizeof(*pid));
    Mess.x[0] = strtol(argv[3], &eptr, 10);
    Mess.x[1] = strtol(argv[4], &eptr, 10);
    Mess.type = 1;

    for(int i = 0; i < n; i++) {
        if ((pid[i] = fork()) == -1) {
            for(int i = 0; i < n; i++) {
                kill(pid[i], SIGKILL);
            }
            while (wait(NULL) != -1);
            msgctl(msg, IPC_RMID, 0);
            free(pid);
            _exit(1);
        }
        if (!pid[i]) {
            while (1) {
                if (msgrcv(msg, &Mess, sizeof(Mess.x), i + 1, 0) != -1) {
                    free(pid);
                    _exit(0);
                }
                long long x0 = Mess.x[0];
                Mess.x[0] = Mess.x[1];
                Mess.x[1] = x0 + Mess.x[1];
                printf("%d %lld\n", i, Mess.x[1]);
                fflush(stdout);
                if (Mess.x[1] > maxval) {
                    for(int i = 0; i < n; i++) {
                        kill(pid[i], SIGKILL);
                    }
                    free(pid);
                    msgctl(msg, IPC_RMID, 0);
                    _exit(0);
                } else {
                    Mess.type = Mess.x[1] % n + 1;
                    msgsnd(msg, &Mess, sizeof(Mess.x), 0);
                }
            }
            _exit(0);
        }
    }
    msgsnd(msg, &Mess, sizeof(Mess.x), 0);
    while(wait(NULL) != -1);
    msgctl(msg, IPC_RMID, 0);
    free(pid);
    return 0;
}