void setup() {
  pinMode(4, INPUT_PULLUP);
  pinMode(7, INPUT_PULLUP);
  pinMode(11, OUTPUT);

}

void loop() {
if(digitalRead(4)==LOW){

   if(digitalRead(7)==LOW){
      digitalWrite(11, HIGH);
   } 
    else{
    digitalWrite(11, LOW);
   }
  }
  else{
    digitalWrite(11, LOW);
  }
}