diff --git a/learn_go_with_tests/mocking/main b/learn_go_with_tests/mocking/main
deleted file mode 100755
index 57fd4f8..0000000
Binary files a/learn_go_with_tests/mocking/main and /dev/null differ
diff --git a/learn_go_with_tests/mocking/main.go b/learn_go_with_tests/mocking/main.go
index e9903e0..434ec4e 100644
--- a/learn_go_with_tests/mocking/main.go
+++ b/learn_go_with_tests/mocking/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"flag"
 	"fmt"
 	"io"
 	"os"
@@ -40,6 +41,10 @@ func Countdown(out io.Writer, sleeper Sleeper, count int) {
 }
 
 func main() {
-	sleeper := &ConfigurableSleeper{1 * time.Second, time.Sleep}
-	Countdown(os.Stdout, sleeper, 3)
+	count := flag.Int("count", 3, "Countdown start number")
+	seconds := flag.Float64("seconds", 1, "Number of sleep seconds between count calls")
+	flag.Parse()
+
+	sleeper := &ConfigurableSleeper{time.Duration(*seconds * float64(time.Second)), time.Sleep}
+	Countdown(os.Stdout, sleeper, *count)
 }