Как я объявляю NaN (не число) в Ruby?

    //you can use only one rand obj to use Random()
    Random rand = new Random();

    //Initializing coins as 0
    //Values of coins will change once we get random 
    int coin1 = 0;
    int coin2 = 0;
    int coin3 = 0;

    //initializing heads and count as 0
    int heads = 0;
    int count = 0;

    while(heads < 3){
        //Assume '1' comes out for head and '0' for tail
         coin1 = rand.nextInt(2);
         coin2 = rand.nextInt(2);
         coin3 =  rand.nextInt(2);

         //if all three coins are '1' which is head; 
         //sum should be 1+1+1 = 3
         //while loop terminates because 3<3 is false
        heads = coin1+coin2+coin3;
        count++; //count = count +1;
    }
    //printing the value of count and coins
    System.out.println(count + "\t" +coin1 + "\t" + coin2 + "\t" +coin3);