int dataPin = PB0;
int clockPin = PB2;
int latchPin = PB1;
int dat1 = PB5;
int dat2 = PB3;
int dat3 = PB4;

void setup() {
  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
  pinMode(dat1, INPUT);
  pinMode(dat2, INPUT);
  pinMode(dat3, INPUT);
}
int num;

void loop() {
  int value1 = digitalRead(dat1);
  int value2 = digitalRead(dat2);
  int value3 = digitalRead(dat3);
  if (value1 == 0)
  {
    if (value2 == 0)
    {
      if (value3 == 0)
      {
        num = 0;
      }
      else
      {
        num = 4;
      }
    }
    else
    {
      if (value3 == 0)
      {
        num = 2;
      }
      else
      {
        num = 6;
      }
    }
  }
  else
  {
    if (value2 == 0)
    {
      if (value3 == 0)
      {
        num = 1;
      }
      else
      {
        num = 5;
      }
    }
    else
    {
      if (value3 == 0)
      {
        num = 3;
      }
      else
      {
        num = 7;
      }
    }
  }
  displayNumber(num);
}
void displayNumber(byte number) {
  int pattern = 0b00000000;
  if (number == 0) {
    pattern = 0b00000011;//0
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, LSBFIRST, pattern);
    digitalWrite(latchPin, HIGH);
    delay(50);
  }

  if (number == 1) {
    pattern = 0b10011111;//1
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, LSBFIRST, pattern);
    digitalWrite(latchPin, HIGH);
    delay(50);
  }

  if (number == 2) {
    pattern = 0b00100101;//2
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, LSBFIRST, pattern);
    digitalWrite(latchPin, HIGH);
    delay(50);
  }

  if (number == 3) {
    pattern = 0b00001101;//3
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, LSBFIRST, pattern);
    digitalWrite(latchPin, HIGH);
    delay(50);
  }

  if (number == 4) {
    pattern = 0b10011001;//4
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, LSBFIRST, pattern);
    digitalWrite(latchPin, HIGH);
    delay(50);
  }

  if (number == 5) {
    pattern = 0b01001001;//5
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, LSBFIRST, pattern);
    digitalWrite(latchPin, HIGH);
    delay(50);
  }

  if (number == 6) {
    pattern = 0b01000001;//6
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, LSBFIRST, pattern);
    digitalWrite(latchPin, HIGH);
    delay(50);
  }
}