diff --git a/day_01/append_helloos.py b/day_01/append_helloos.py
new file mode 100644
index 0000000..1cfca25
--- /dev/null
+++ b/day_01/append_helloos.py
@@ -0,0 +1,22 @@
+"""
+This script is used to attach zero bytes to img file
+REMENBER TO CHECK 0x01FF AND 0x1400
+"""
+
+def append_zeros_to_bin_file(file_path, target_size_hex):
+    target_size = int(target_size_hex, 16)  # Convert hex size to decimal
+    with open(file_path, "ab") as file:  # Open the file in append binary mode
+        file.seek(0, 2)  # Go to the end of the file
+        current_size = file.tell()  # Get the current size of the file
+        zeros_to_add = (
+            target_size - current_size
+        )  # Calculate the number of zeros to add
+
+        if zeros_to_add > 0:
+            file.write(b"\x00" * zeros_to_add)  # Append the zeros
+        else:
+            print("File is already at or exceeds the target size.")
+
+
+# Usage
+append_zeros_to_bin_file("helloos.img", "0x168000")
diff --git a/day_01/asm_result.png b/day_01/asm_result.png
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diff --git a/day_01/helloos.asm b/day_01/helloos.asm
new file mode 100644
index 0000000..886732e
--- /dev/null
+++ b/day_01/helloos.asm
@@ -0,0 +1,25 @@
+; Hello World Program in 16-bit Assembly
+; This code is intended to run on a DOS system.
+
+.model small
+.stack 100h
+
+.data
+helloMessage db 'Hello, World!$'
+
+.code
+start:
+    ; Initialize the data segment
+    mov ax, @data
+    mov ds, ax
+
+    ; Display the message
+    mov ah, 09h ; AH = 09h for displaying a string in DOS
+    lea dx, helloMessage ; Load the address of the message into DX
+    int 21h ; Call DOS interrupt
+
+    ; Terminate the program
+    mov ax, 4C00h ; Terminate program
+    int 21h
+
+end start
diff --git a/day_01/helloos.img b/day_01/helloos.img
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index 0000000..cdf0659
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diff --git a/day_01/result.png b/day_01/result.png
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