Programming Challenges Question 3

Programming Challenges Question 
Kermit, a frog hops in a particular way such that:
1. He hops 20cm in the first hop, 10cm in the second hop and 5cm in the third hop.
2. After three hops Kermit rests for a while and then again follows the same hopping pattern.
Calculate the total distance travelled by Kermit (in centimeters) for the provided number of hops. Exactly 4 numbers of hops will be provided to the program (one number per line) as per the below example.

Suppose the following number of hops is provided to the program:
4
6
3
5
Then the total distance covered should be displayed as follows:
55
70
35
65

/*********************Code in JAVA*******************************8/
import java.util.Scanner;
public class Main
{
    public static void main(String args[])
    {
      int a,b,c,d;
  Scanner in = new Scanner(System.in);
  a = in.nextInt();
  b = in.nextInt();
  c = in.nextInt();
  d = in.nextInt();
  int[] array = {a,b,c,d};
  int k = 0;

  for(int i=0; i<array.length; i++){
  int n = array[i];
  int x = n/3;
  int y = n%3;
  int z = x*35;

   switch(y){
   case 0: k = 0 + z; break;
   case 1: k = 20 + z; break;
   case 2: k = 30 + z; break;
   case 3: k = 35 + z; break;
   }
  System.out.println(k);
  }
}
}