diff --git a/main.go b/main.go
new file mode 100644
index 0000000..d8c7633
--- /dev/null
+++ b/main.go
@@ -0,0 +1 @@
+package go_study
diff --git a/math.go b/math.go
new file mode 100644
index 0000000..06ab7d0
--- /dev/null
+++ b/math.go
@@ -0,0 +1 @@
+package main
diff --git a/math_test.go b/math_test.go
new file mode 100644
index 0000000..06ab7d0
--- /dev/null
+++ b/math_test.go
@@ -0,0 +1 @@
+package main