int add = 19;
int minus = 18;
int in3 = 23;
int in2 = 22;
int in1 = 21;
int in0 = 5;
int en3 = 17;
int en2 = 16;
int en1 = 4;
int en0 = 0;
int out4 = 27;
int out3 = 26;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
 
 
}