void setup()
{
  Serial.begin(9600);
  pinMode(13, OUTPUT);
  pinMode(0, INPUT);
  pinMode(1, INPUT);
  pinMode(2, INPUT); 
  pinMode(3, INPUT);
  pinMode(4, INPUT);
  pinMode(5, INPUT);
  pinMode(6, INPUT); 
  pinMode(7, INPUT);
  pinMode(8, INPUT);
  pinMode(9, INPUT);
  pinMode(10, INPUT); 
  pinMode(11, INPUT);
}

int i=0, j=0, k=0, l=0;
int m=0, n=0, o=0;

void loop()
{
  if(digitalRead(0)){
    i = 1;
  } else i = 0;
  if(digitalRead(1)){
    j = 2;
  } else j = 0;
  if(digitalRead(2)){
    k = 4;
  } else k = 0;
  if(digitalRead(3)){
    l = 8;
  } else l = 0;
  
  m = i + j + k + l;
  
  i=0, j=0, k=0, l=0;
  
  if(digitalRead(4)){
    i = 1;
  } else i = 0;
  if(digitalRead(5)){
    j = 2;
  } else j = 0;
  if(digitalRead(6)){
    k = 4;
  } else k = 0;
  if(digitalRead(7)){
    l = 8;
  } else l = 0;
  
  n = i + j + k + l;
  
  i=0, j=0, k=0, l=0;
  
  if(digitalRead(8)){
    i = 1;
  } else i = 0;
  if(digitalRead(9)){
    j = 2;
  } else j = 0;
  if(digitalRead(10)){
    k = 4;
  } else k = 0;
  if(digitalRead(11)){
    l = 8;
  } else l = 0;
  
  o = i + j + k + l;
  
  i=0, j=0, k=0, l=0;
  
  Serial.print("x= ");
  Serial.println(o);
  
  Serial.print("y= ");
  Serial.println(n);
  
  Serial.print("z= ");
  Serial.println(m);
  
  Serial.println("end");
  
  if(n>11){
    digitalWrite(13, HIGH);
  }
  else digitalWrite(13, LOW);
  
  m = 0;  
}