diff --git a/Day-05/task SYS and OS b/Day-05/task SYS and OS
new file mode 100644
index 00000000..13dd3e07
--- /dev/null
+++ b/Day-05/task SYS and OS	
@@ -0,0 +1,39 @@
+import sys
+import os
+def add(num1,num2):
+    return(num1+num2)
+
+def sub(num1,num2):
+    if(num1>num2):
+        return(num1-num2)
+    else:
+        return(num2-num1)
+def mult(num1,num2):
+    return(num1*num2)
+def div(num1,num2):
+    if(num2==0):
+        print("Division by zero error!")
+    else:
+        return(num1/num2)
+num1=float(sys.argv[1])
+oper=str(sys.argv[2])
+num2=float(sys.argv[3])
+print(num1,oper,num2)
+
+if(oper=="+"):
+    res=add(num1,num2) 
+    print("Addition of two number: ",res) 
+elif(oper=="-"):
+    res=sub(num1,num2)
+    print("Subtraction of two number: ",res)
+elif(oper=="x"):
+    res=mult(num1,num2)
+    print("Multiplication of two number: ",res)
+elif(oper=="/"):
+    res=div(num1,num2)
+    print("Division of two number: ",res)
+else:
+    print("You have enter wrong input")
+
+for key in os.environ:
+    print(key,"->",os.environ[key])
diff --git a/README.md b/README.md
index 23ecf82a..1b9e27e9 100644
--- a/README.md
+++ b/README.md
@@ -57,8 +57,7 @@
   - Example: Automating a log file analysis with a loop to find errors.
 
 ## Day 10: Working with Lists (Part 2)
-- List comprehensions.
-- Nested lists and advanced list operations.
+- Advanced list operations.
 - Practice exercises and examples:
   - Example: Print list of files in the list of folders provided