void setup() {
  Serial.begin(9600);
}

void loop() {
  
  // Type in a number
  uint32_t number = readLong();
  
  Serial.println(number);  
}


/* Read a long off of the serial port and return. */
int32_t readLong()
{
  char s[128]; /* 128 characters should be more than enough. */
  readLine(s, 127);
  s[127] = '\0';
  return atol(s);
}
 
/* Read a line (up to maxlen characters) off of the serial port. */
void readLine(char *s, uint8_t maxlen)
{
  uint8_t i = 0;
  
  while(1) {
    while (Serial.available() == 0) { } /* Do nothing */
    s[i] = Serial.read();
    if (s[i] == '\0' || s[i] == '\n' || i == maxlen-1) break;
    i += 1;
  }
}