int led1 = 6; 
int led2 = 7; 
int led3 = 8; 
int led4 = 9; 
int cubo1 = 2; 
int cubo2 = 3;
int cubo3 = 4;
int cubo4 = 5;
int flag = 0;
int i=0;
int e=0;

void minuto()
  {
    for (i=0; i<=59; i++)
      delay(1000);
  }

void hora()
  {
    for (e=0; e<=5; e++)  
      minuto();
  }

void setup () { 
  
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(cubo1, OUTPUT);
  pinMode(cubo2, OUTPUT);
  pinMode(cubo3, OUTPUT);
  pinMode(cubo4, OUTPUT);
  digitalWrite(led1, HIGH);
  digitalWrite(led2, HIGH);
  digitalWrite(led3, HIGH);
  digitalWrite(led4, HIGH);
  digitalWrite(cubo1, LOW);
  digitalWrite(cubo2, LOW);
  digitalWrite(cubo3, LOW);
  digitalWrite(cubo4, LOW);
} 

void loop () { 
  if (flag==0)
  {
  flag=1;
  digitalWrite(cubo1, HIGH);
  hora();
  //delay(3000);
  digitalWrite(led1, LOW);
  digitalWrite(cubo1, LOW);
  digitalWrite(cubo2, HIGH);
  hora();
  //delay(3000);
  digitalWrite(led2, LOW);
  digitalWrite(cubo2, LOW);
  digitalWrite(cubo3, HIGH);
  hora();
  //delay(3000);
  digitalWrite(led3, LOW);
  digitalWrite(cubo3, LOW);
  digitalWrite(cubo4, HIGH);
  hora();
  //delay(3000);
  digitalWrite(led4, LOW);
  digitalWrite(cubo4, LOW);
  }
  
}