diff --git a/README.md b/README.md
index b42e7d3..7156aa3 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,26 @@
 # penjumlahan_yang_dibatalkan
 
+ def proses_penjumlahan(urutan):
+    stack = []
+    for item in urutan:
+        if item == 'B':
+            if len(stack) >= 2:
+                stack.pop()  # hapus penjumlahan terakhir
+        else:
+            angka = int(item)
+            if stack:
+                angka += stack[-1]
+            stack.append(angka)
+    return stack[-1] if stack else 0
+
+## Input data dari soal
+data_input = [
+    ["2", "2", "B", "10", "7", "B", "5", "B", "11", "B"],     # h#1
+    ["1", "1", "1", "1", "1", "1", "1", "1", "1", "1", "1"],  # h#2
+    ["10", "B", "2", "B", "2", "B", "2"]                      # h#3
+]
+
+### Menjalankan program dan mencetak hasil
+for idx, data in enumerate(data_input, 1):
+    hasil = proses_penjumlahan(data)
+    print(f"h#{idx}: {hasil}")