```ruby
Test::Feature "Addition" do
  To "avoid silly mistakes"
  As "a math idiot"
  We "need to calculate the sum of numbers"

  Scenario "Add two numbers" do
    Given "I have a calculator"
    Given "I have entered 50 into the calculator"
    Given "I have entered 70 into the calculator"
    When  "I press add"
    Then  "the result should be 120 on the screen"
  end

  Scenario "Add three numbers" do
    Given "I have a calculator"
    Given "I have entered 50 into the calculator"
    Given "I have entered 70 into the calculator"
    Given "I have entered 90 into the calculator"
    When  "I press add"
    Then  "the result should be 210 on the screen"
  end

  Given 'I have a calculator' do
    require 'calculator'
    @calculator = Calculator.new
  end

  Given 'I have entered (((\d+))) into the calculator' do |n|
    @calculator.push n.to_i
  end

  When 'I press add' do
    @result = @calculator.add
  end

  Then 'the result should be (((\d+))) on the screen' do |n|
    @result.assert == n.to_i
  end
end

```

Update example to reflect new match pattern.
user
```ruby
Feature "Addition" do
  To "avoid silly mistakes"
  As "a math idiot"
  We "need to calculate the sum of numbers"

  Scenario "Add two numbers" do
    Given "I have a calculator"
    Given "I have entered 50 into the calculator"
    Given "I have entered 70 into the calculator"
    When  "I press add"
    Then  "the result should be 120 on the screen"
  end

  Scenario "Add three numbers" do
    Given "I have a calculator"
    Given "I have entered 50 into the calculator"
    Given "I have entered 70 into the calculator"
    Given "I have entered 90 into the calculator"
    When  "I press add"
    Then  "the result should be 210 on the screen"
  end

  Given 'I have a calculator' do
    require 'calculator'
    @calculator = Calculator.new
  end

  Given 'I have entered (\d+) into the calculator' do |n|
    @calculator.push n.to_i
  end

  When 'I press add' do
    @result = @calculator.add
  end

  Then 'the result should be (\d+) on the screen' do |n|
    @result.assert == n.to_i
  end
end

```
assistant