1059: 组合数计算

Memory Limit:128 MB Time Limit:1 S
Judge Style:Text Compare Creator:
Submit:657 Solved:478

Description

C = K!/(R!*(K-R)!)(K > R > 0),输入R、K,求C

Input

输入2个正整数R和K

Output

输出C

Sample Input Copy

3 5

Sample Output Copy

10

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