1035: 求s=1+1/2!+1/3!+…+1/n!

Memory Limit:128 MB Time Limit:1 S
Judge Style:Text Compare Creator:
Submit:607 Solved:408

Description

求s=1+1/2!+1/3!+…+1/n!

Input

输入一个正整数n

Output

输出s的值,结果保留4位小数

Sample Input Copy

3

Sample Output Copy

1.6667

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