public class Main{
  public static void main(String[] args){
    int[] a;
    a = new int[60];

    for(int i=0; i<a.length; i++){
      a[i] = (int)(Math.random()*6+1);
    }
    double count1 = 0;
    double count2 = 0;
    double count3 = 0;
    double count4 = 0;
    double count5 = 0;
    double count6 = 0;

    for(int i=0; i<a.length; i++){
      if(a[i]==1){
        count1++;}
      if(a[i]==2){
        count2++;}
      if(a[i]==3){
        count3++;}
      if(a[i]==4){
        count4++;}
      if(a[i]==5){
        count5++;}
      if(a[i]==6){
        count6++;
      }
    }


    double q = Math.pow(count1-10,2);
    double r = Math.pow(count2-10,2);
    double s = Math.pow(count3-10,2);
    double t = Math.pow(count4-10,2);
    double u = Math.pow(count5-10,2);
    double v = Math.pow(count6-10,2);

    double count = q + r + s + t + u + v;

    System.out.println(count/10);





  }
}