Assistance in diploma. Question programming the Arduino mega

Projects Programming
7

Use a variable to count the number of times it's HIGH. If the variable is less than 3, do your turning, if 3 then don't do turning. Something like this:

int turnCount =0;  //put this before setup()
void loop(){
 if (digitalRead(31) == HIGH && turnCount <3){ 
    turnCount++;  //increase the count
// your current turn code here
  }
//You will need to reset turnCount to 0 at some time 
//but you've not given any information on how and when you want this.
// probably you'll want to do it in the else part.
}