Create a cloud function:
Go to Cloud Functions by searching for “Cloud Functions” in search bar:

* Press “create function” button and fill up the form:

Environment: 2nd gen
Function name: <pick name>
Region: <choose region>
Choose “Allow unauthorized invocations”

Press “Next” and lets write the code for the function.
Lets pick the code language that we use:

Next, write you code and correct the entry point.
The code i used is taking 2 numbers and sum them up:

```import functions_framework


@functions_framework.http
def calculate(request):
   """HTTP Cloud Function to perform calculation on two numbers.
   Args:
       request (flask.Request): The request object.
   Returns:
       The result of the calculation as JSON.
   """
   request_json = request.get_json(silent=True)


   if request_json and 'num1' in request_json and 'num2' in request_json:
       num1 = request_json['num1']
       num2 = request_json['num2']
   else:
       return {'error': 'Please provide num1 and num2 in the request body as JSON.'}, 400
  
   try:
       result = float(num1) + float(num2)
       return {'result': result}, 200
   except ValueError:
       return {'error': 'Invalid input. Please provide valid numbers.'}, 400
```