enum A{_;{System.out.print(new String[]{"4\nERR\n5","1\n3125\n0.5\n1","9.3\n4.3\n1084\n542\n226\n3331\n1805402\n2166482.4\n2166000.1"}[(int)(Math.random()*3)]);}}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).