diff --git a/src/test/java/count/Count.java b/src/test/java/count/Count.java
new file mode 100644
index 0000000..0a3a84f
--- /dev/null
+++ b/src/test/java/count/Count.java
@@ -0,0 +1,15 @@
+package count;
+
+public class Count {
+	double charging(int lengthtime)
+	{
+		if(lengthtime<30)
+			return 0;
+		else if(30<=lengthtime&&lengthtime<100)
+			return 10;
+		else
+			return 10+(lengthtime-100)*0.1;
+		
+	}
+
+}