ID: 1342

Type: Default

1000ms

256MiB

Difficulty: 9

Uploaded By:

吴泽宏 (wuzehong)

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

Limitation

1s, 1024KiB for each test case.