void setup()
 {
   pinMode(13, OUTPUT);  
   pinMode(12, OUTPUT);
   pinMode(11, OUTPUT);  
   pinMode(10, OUTPUT);
   pinMode(7,INPUT);
}
int ps1=0,ps2=0;
void loop() {
ps1 = digitalRead(7); 
ps2 = digitalRead(6);
if (ps1==1) 
{
    if (ps2==1)
    {
      digitalWrite(10, HIGH);
      digitalWrite(11, LOW);
      digitalWrite(12, LOW);
      digitalWrite(13, LOW);
    }
    else
    {
      digitalWrite(10, LOW);
      digitalWrite(11, HIGH);
      digitalWrite(12, LOW);
      digitalWrite(13, LOW);
    }  
}
else if (ps1==0 )
{
  if (ps2==1)
  {
      digitalWrite(10, LOW);
      digitalWrite(12, HIGH);
      digitalWrite(11, LOW);
      digitalWrite(13, LOW);
  }
  else
  {
      digitalWrite(10,LOW);
      digitalWrite(11, LOW);
      digitalWrite(12, LOW);
      digitalWrite(13, HIGH);
  }
}
}