diff --git a/rtanaka/src/c148.java b/rtanaka/src/c148.java
new file mode 100644
index 0000000000000000000000000000000000000000..7fce79f6b2d7182a2cf082d9455cb42a896a4b7a
--- /dev/null
+++ b/rtanaka/src/c148.java
@@ -0,0 +1,29 @@
+import java.util.Scanner;
+
+public class C148 {
+	public static void main(String[] args) {
+		
+		Scanner scanner = new Scanner(System.in);
+		int numberOfBattles = scanner.nextInt();
+		int ownLev = scanner.nextInt();
+		
+		for (int i = 0; i < numberOfBattles; i++) {
+			int enemyLev = scanner.nextInt();
+			// 自分のレベルが相手より低い場合
+			if (ownLev < enemyLev) {
+				ownLev /= 2;
+
+			// 自分のレベルが相手より高い場合
+			} else if (ownLev > enemyLev) {
+				enemyLev /= 2;
+				ownLev += enemyLev;
+			// レベルが同じ場合
+			} else {
+				continue;
+			}
+		}
+		System.out.println(ownLev);
+		scanner.close();
+	}
+
+}
\ No newline at end of file