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The math teacher calls Petya up to the blackboard.

'Imagine that your father has borrowed a hundred roubles from a neighbour,' says the teacher, 'and has promised to give the money back in two weeks. The first week he gives back forty roubles. How much would he give back the second week?'

'None at all,' replies Petya.

'What do you mean, none at all?' the teacher asks, surprised. 'You weren't listening properly.

Let me repeat: imagine that your father has borrowed a hundred roubles and promised to repay the money in two weeks. The first week he gives back forty roubles. How much would he give back the second week?'

'None at all!' repeats Petya.

'Oh, Petya,' the teacher is annoyed. 'You don't know the simplest arithmetic!'

'And you don't know my father . . .'