int ledm = 2;
int ledk = 3;
int ledh = 4;
int waktum;
int waktuk;
int waktuh;

void setup() {
 Serial.begin(9600);
 pinMode(ledm, OUTPUT);
 pinMode(ledk, OUTPUT);
 pinMode(ledh, OUTPUT);
 waktum= 10;
 waktuk= 5;
 waktuh= 10;
}

void loop() {
menu1:
waktum--;
Serial.println(waktum);
digitalWrite(ledm, HIGH);
digitalWrite(ledk, LOW);
digitalWrite(ledh, LOW);
if(waktum == 0)goto menu2;
delay(1000);
goto menu1;

menu2:
waktuk--;
Serial.println(waktuk);
digitalWrite(ledm, LOW);
digitalWrite(ledk, HIGH);
digitalWrite(ledh, LOW);
if(waktuk == 0)goto menu3;
delay(1000);
goto menu2;

menu3:
waktuh--;
Serial.println(waktuh);
digitalWrite(ledm, LOW);
digitalWrite(ledk, LOW);
digitalWrite(ledh, HIGH);
delay(1000);
goto menu3;
}