const int dataPin = 2;
const int clockPin = 4;
const int latchPin = 16;
const int btnPin = 13;
int cnt = 0;
bool flag = 1;
int debounce = 200;
int sn;
unsigned long trigTime = 0;
const byte num[] = {
  0b11111100,
  0b01100000,
  0b11011010,
  0b11110010,
  0b01100110,
  0b10110110,
  0b10111110,
  0b11100000,
  0b11111110,
  0b11110110,
  0b00000000,
};
void press() {
  if (millis() - trigTime > debounce) {
    cnt += 1;
    flag = !flag;
    trigTime = millis();
  }
}
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(btnPin, INPUT_PULLUP);
  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
  attachInterrupt(btnPin, press, RISING);
  digitalWrite(clockPin, LOW);
  digitalWrite(latchPin, LOW);
}
void displayNum(int n) {
  for (int i = 0; i < 8; i++) {
    digitalWrite(dataPin, !bitRead(num[n], i));
    digitalWrite(clockPin, HIGH);
    digitalWrite(clockPin, LOW);
  }
  digitalWrite(latchPin, HIGH);
  digitalWrite(latchPin, LOW);
}
void loop() {
  // put your main code here, to run repeatedly:
  if (Serial.available()>0) {
    sn = Serial.parseInt();
    Serial.println(sn);
  }
  if (flag && cnt == 0) {
    for (int i = 0; i <= 9; i++) {
      displayNum(i);
      delay(400);
      if (!flag) break;
    }
  } else {
    displayNum(10);
  }
  if (flag && cnt == 1) {
    for (int i = sn; i >= 0; i--) {
      if (i > 4) {
        displayNum(i);
        delay(1000);
      } else {
        for (int j = 0; j < 4; j++) {
          displayNum(i);
          delay(200);
          displayNum(10);
          delay(200);
        }
      }
    }
  }
}