Doubt about if, Elif and Else

Question

Good morning/late/evening

I started to venture into the recent python and was making a code for a simple calculator exercise.

print('Calculadora simples')


def calculadora():
    x1 = int(input('Digite o primeiro digito: '))
    x = input('Agora digite a natureza da operação: ')
    x2 = int(input('Digite o segundo digito: '))

    if x == '+':
        x3 = x1 + x2
        print('Seu resultado foi: ',x3)
        sair = str(input('Fazer de novo? (S/N)'))

        if sair == 'N' or 'n': #AQUI O ERRO
            print('Saindo...')

        elif sair == 'S' or 's':
           return calculadora()

        else:
            calculadora()


calculadora()

In the if part inside if in sum, when I run it ignores Elif, and only executes if in the beginning.