diff --git a/history/001_first_version/src/main/java/com/github/drinkjava2/frog/brain/Input.java b/history/001_first_version/src/main/java/com/github/drinkjava2/frog/brain/Input.java
new file mode 100644
index 0000000..984acf2
--- /dev/null
+++ b/history/001_first_version/src/main/java/com/github/drinkjava2/frog/brain/Input.java
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2018 the original author or authors. 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
+ * applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
+ * OF ANY KIND, either express or implied. See the License for the specific
+ * language governing permissions and limitations under the License.
+ */
+package com.github.drinkjava2.frog.brain;
+
+import com.github.drinkjava2.frog.egg.Zone;
+
+/**
+ * Input is the sensor of nerve cell
+ * 
+ * @author Yong Zhu
+ * @since 1.0.0
+ */
+public class Input  extends Zone{ 
+	public float energy;
+	public Cell cell;
+}