long time = 0;
volatile byte flaga = 0;

void setup()
{
pinMode(RED_LED, OUTPUT);
pinMode(GREEN_LED, OUTPUT);
pinMode(BLUE_LED, OUTPUT);
pinMode(PUSH1, INPUT_PULLUP);
pinMode(PUSH2, INPUT_PULLUP);

}

void loop()
{
  time = random(500,5000);
  delay(time);
  digitalWrite(BLUE_LED, HIGH);
  attachInterrupt(PUSH1, red_przerwanie, FALLING);
  attachInterrupt(PUSH2, green_przerwanie, FALLING);
  flaga = 0;
  while(flaga < 1){};
}

void red_przerwanie()
{
    detachInterrupt(PUSH1);
    detachInterrupt(PUSH2);
    digitalWrite(BLUE_LED, LOW);
    digitalWrite(RED_LED, HIGH);
    delay(1000);
    digitalWrite(RED_LED, LOW);
    flaga = 1;
}

void green_przerwanie()
{
    detachInterrupt(PUSH1);
    detachInterrupt(PUSH2);
    digitalWrite(BLUE_LED, LOW);
    digitalWrite(GREEN_LED, HIGH);
    delay(1000);
    digitalWrite(GREEN_LED, LOW);
    flaga = 1;
}