add EndlessRunTheSequel solution

Author: jakovmitrovski

easy200/LearningChess.java

@@ -1,7 +1,5 @@
 package easy200;
 
-import java.util.Arrays;
-
 public class LearningChess {
     public int numberOfMoves(String knight, String[] pieces) {
 

medium300/EndlessRunTheSequel.java

@@ -0,0 +1,7 @@
+package medium300;
+
+public class EndlessRunTheSequel {
+    public int calculateOnes(int n) {
+        return 1 << (Integer.bitCount(n));
+    }
+}