'Conver a string to integer from Textinput to Label kivy

I need to convert my root.ids.input_tornillo.text in Integer for multiplying it times 2, but I got an Error in my root.ids.label_tornillo.text.. How can I fix it?

kv.py

TextInput: 
                id: input_tornillo
                text: ""
                halign: "right"
                font_size: 18
                multiline: True
                #size_hint: (1, .15)

            Label:
                id: label_tornillo
                text: int(root.ids.input_tornillo.text)*2  
                      #HERE IS THE MISTAKE

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'Conver a string to integer from Textinput to Label kivy

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