diff --git a/Question04-while/src/PTra04_02.java b/Question04-while/src/PTra04_02.java
index 4ce7b65..a0b9360 100644
--- a/Question04-while/src/PTra04_02.java
+++ b/Question04-while/src/PTra04_02.java
@@ -16,5 +16,13 @@ public class PTra04_02 {
 		 *  ※ 繰り返しにはwhile文を用いてください
 		 */
 
+		while (num <= 1000) {
+			//num = num * 2;
+
+			num *= 2;
+
+			System.out.println(num);
+		}
+
 	}
 }