#1342. C++-数字排列-数字1~7排列组合成7位数字，不打印排列的数字但计算出总数量并打印

C++-数字排列-数字1~7排列组合成7位数字，不打印排列的数字但计算出总数量并打印

Background

Description

数字排列-数字1~7排列组合成7位数字，不打印排列的数字但计算出总数量并打印

Format

Input

Output

Samples



5040

Limitation

1s, 1024KiB for each test case.

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