diff --git a/rtanaka/src/B158.java b/rtanaka/src/B158.java
new file mode 100644
index 0000000000000000000000000000000000000000..f86368f1867e51a3364f718de1007e4318542b47
--- /dev/null
+++ b/rtanaka/src/B158.java
@@ -0,0 +1,36 @@
+import java.util.Scanner;
+
+/**
+ * 正方形の盤に積まれた石をピラミッド型に整理するjavaファイル
+ * @author 田中亮汰
+ * @version 1.0
+ */
+
+public class B158 {
+
+	public static void main(final String[] args) {
+		/* 入力 */
+		PyramidStore store = new PyramidStore();
+		Scanner scan = new Scanner(System.in);
+		store.setBoardLength(scan.nextInt());// 盤の一辺の長さ
+		int boardLength = store.getBoardLength();
+			
+		// 盤に対する石の個数を受け取る
+		int[][] boardStone = new int[boardLength][boardLength];
+		for (int i = 0; i < boardLength; i++) {
+			for (int j = 0; j < boardLength; j++) {
+				boardStone[i][j] = scan.nextInt();
+			}
+		}
+		store.setBoardStone(boardStone);
+		scan.close();
+		
+		/* 計算 */
+		PyramidCalculation calculation = new PyramidCalculation(store);
+		calculation.calculateIdealBoard();// 理想の盤面を計算するメソッド
+		calculation.compareAndRemoveStones();// 盤面を比較し、除去すべき石の数を計算するメソッド
+		/*出力*/
+		System.out.println(store.getBoardStoneSum());
+	}
+
+}
\ No newline at end of file
diff --git a/rtanaka/src/PyramidCalculation.java b/rtanaka/src/PyramidCalculation.java
new file mode 100644
index 0000000000000000000000000000000000000000..d67b5cff00e424c06b4543df03792c7a6b3bf831
--- /dev/null
+++ b/rtanaka/src/PyramidCalculation.java
@@ -0,0 +1,49 @@
+/**
+ * PyramidInputから値を受けとり計算しメインに値を渡すクラスファイル
+ * 
+ * @author 田中亮汰
+ * @version 1.0
+ */
+public class PyramidCalculation {
+	PyramidStore pyramidStore;
+	private int[][] boardStoneIdeal;
+	private int[][] boardStoneCompare;
+	private int boardStoneSum = 0;
+	final int BOARD_LENGTH;
+
+	// 保存クラスのインスタンスを受け取る
+	public PyramidCalculation(PyramidStore store) {
+		this.pyramidStore = store;
+		this.BOARD_LENGTH = this.pyramidStore.getBoardLength();
+	}
+
+	// 理想の盤面を計算するメソッド
+	public void calculateIdealBoard() {
+		boardStoneIdeal = new int[BOARD_LENGTH][BOARD_LENGTH];
+		for (int i = 0; i < BOARD_LENGTH; i++) {
+			for (int j = 0; j < BOARD_LENGTH; j++) {
+				int pyramidEdge = Math.min(Math.min(i, j), Math.min(BOARD_LENGTH - 1 - i, BOARD_LENGTH - 1 - j));
+				boardStoneIdeal[i][j] = pyramidEdge + 1;// 最小値0の所から石を1つ置くので+1
+			}
+		}
+	}
+
+	// 盤面を比較し、除去すべき石の数を計算するメソッド
+	public void compareAndRemoveStones() {
+		boardStoneCompare = new int[BOARD_LENGTH][BOARD_LENGTH];
+		for (int i = 0; i < BOARD_LENGTH; i++) {
+			for (int j = 0; j < BOARD_LENGTH; j++) {
+				boardStoneCompare[i][j] = pyramidStore.getBoardStone(i, j) - boardStoneIdeal[i][j];
+			}
+		}
+
+		// 除去する石の個数を集計
+		for (int[] stoneCounts : boardStoneCompare) {
+			for (int stoneCount : stoneCounts) {
+				boardStoneSum += stoneCount;
+			}
+		}
+		pyramidStore.setBoardStoneSum(boardStoneSum);
+	}
+
+}
\ No newline at end of file
diff --git a/rtanaka/src/PyramidStore.java b/rtanaka/src/PyramidStore.java
new file mode 100644
index 0000000000000000000000000000000000000000..3b38006ba0edd03caa8e70a2da6e83c1b834089d
--- /dev/null
+++ b/rtanaka/src/PyramidStore.java
@@ -0,0 +1,33 @@
+
+public class PyramidStore {
+	private int boardLength;
+	private int[][] boardStone;
+	private int boardStoneSum;
+	
+	public int[][] getBoardStone() {
+		return boardStone;
+	}
+	public int getBoardStone(int i, int j ) {
+		return boardStone[i][j];
+	}
+
+	public int getBoardLength() {
+		return boardLength;
+	}
+	
+	public int getBoardStoneSum() {
+		return boardStoneSum;
+	}
+	
+	public void setBoardStone(int[][]boardStone) {
+		 this.boardStone = boardStone;
+	}
+
+	public void setBoardLength(int boardLength) {
+		this.boardLength = boardLength;
+	}
+	
+	public void setBoardStoneSum(int boardStoneSum) {
+		this.boardStoneSum = boardStoneSum;
+	}
+}