diff --git a/Lesson_4/.gitignore b/Lesson_4/.gitignore
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index 0000000..b881d2f
--- /dev/null
+++ b/Lesson_4/.gitignore
@@ -0,0 +1 @@
+data.txt
diff --git a/Lesson_4/task1.py b/Lesson_4/task1.py
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--- /dev/null
+++ b/Lesson_4/task1.py
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+# Lesson 4 Task 1: write system info to a file
+# Author: Stanislav Mykhailenko
+# License: Unlicense
+
+# Return codes:
+# 0 - OK
+
+import platform, psutil
+
+data = [False,False,False,False]
+selection = None
+while True:
+	selection = input("a) CPU [" + str(data[0]) + "]\nb) RAM [" + str(data[1]) + "]\nc) Architecture [" + str(data[2]) + "]\nd) CPU Family [" + str(data[3]) + "]\ny) Proceed\n")
+	if selection == "y":
+		break
+	if not len(selection) == 1 or ord(selection) < ord("a") or ord(selection) > ord("d"):
+		print("Invalid selection.")
+		continue
+	number = ord(selection) - ord("a")
+	data[number] = not data[number]
+
+anythingTrue = False
+if data[0] or data[1] or data[2] or data[3]:
+	anythingTrue = True
+
+if anythingTrue:
+	file_out = open("data.txt", "w")
+
+	if data[0]:
+		file_out.write("CPU: " + platform.processor() + "\n")
+	if data[1]:
+		file_out.write("RAM: " + str(psutil.virtual_memory()) + "\n")
+	if data[2]:
+		file_out.write("Architecture: " + str(platform.architecture()) + "\n")
+	if data[3]:
+		file_out.write("CPU family: " + platform.machine() + "\n")
+
+	file_out.close()