Various incomplete solutions

CodeChef/easy/HS08TEST/solve.php

@@ -0,0 +1,13 @@
+<?php
+while($s=explode(' ',trim(fgets(STDIN)))) {
+	
+	if($s[1]%5) {
+		echo $s[1];
+		} else {
+			$new = round($s[1]-$s[1]-0.5,2);
+			if($new) 
+				echo $new;
+				else 
+				echo $s[1];
+				}
+		}