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Time limit per test: 0.5 second(s)

Memory limit: 262144 kilobytes

Memory limit: 262144 kilobytes

input: standard

output: standard

output: standard

A member

Compute the total number of extremal permutations of the integers from 1 to

sample input | sample output |

3 10 | 4 |

sample input | sample output |

3 3 | 1 |

Note. The extremal permutations of 1·s3 are (1, 3, 2), (2, 1, 3), (2, 3, 1) and (3, 1, 2).

Codeforces (c) Copyright 2010-2020 Mike Mirzayanov

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