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Problem1727--互素
1727: 互素
[Creator :
]
Time Limit :
1.000
sec
Memory Limit :
128 MB
Solved: 0
Submit: 555
Statistics
Description
求小于n且与n互素的整数个数。
Input
整数n,n<=10
9
Output
互素的整数个数
Sample Input
Copy
18
Sample Output
Copy
6
HINT
欧拉函数
Source/Category