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

int main(){
    while (1)
    {
        system("echo 1 > /sys/class/leds/led1/brightness");
        usleep(200000);
        system("echo 1 > /sys/class/leds/led2/brightness");
        usleep(200000);
        system("echo 1 > /sys/class/leds/led3/brightness");
        usleep(200000);
        system("echo 0 > /sys/class/leds/led1/brightness");
        usleep(200000);
        system("echo 0 > /sys/class/leds/led2/brightness");
        usleep(200000);
        system("echo 0 > /sys/class/leds/led3/brightness");
    }
    return 0;
}