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Count primes

Time Limit: 12000/6000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)
Total Submission(s): 3432 Accepted Submission(s): 1734

Problem Description

Easy question! Calculate how many primes between [1...n]!

Input

Each line contain one integer n(1 <= n <= 1e11).Process to end of file.

Output

For each case, output the number of primes in interval [1...n]

Sample Input

2
3
10

Sample Output

1
2
4

Source

2016 ACM/ICPC Asia Regional Shenyang Online

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