int npins = 52;
int len = 34;
boolean red[54];

void setup()
{
  Serial.begin(9600);
  for (int i=1; i<35; i++)
  {
    pinMode(i,INPUT);
  }
  for (int i=1; i<35; i++)
  {
    red[i] = false;
  }

}

void loop()
{
  for (int i=2;i<npins+2;i++)
  {
    if (digitalRead(i)+1> 1)
    {
      if (i>0 && i<34 && !red[i]) {Serial.print(i-1); Serial.println(); red[i] = true;}
      //else if (i==5 && !red[i]) {Serial.print(34); Serial.println(); red[i] = true;}
      //else if (i==6 && !red[i]) {Serial.print(4); Serial.println(); red[i] = true;}
      //else if(i>21 && i<54 && !red[i])
      //{
       // if (i%2==0) {Serial.print((i-20)/2 + 4); Serial.println(); red[i] = true;}
       // else if (i%2==1) {Serial.print(i/2+7); Serial.println(); red[i] = true;}

      //}
    }

  }
  delay(30);
}