Time Limit: 12000/6000 MS (Java/Others)
Memory Limit: 65536/65536 K (Java/Others)
Easy question! Calculate how many primes between [1...n]!
Each line contain one integer n(1 <= n <= 1e11).Process to end of file.
For each case, output the number of primes in interval [1...n]
2016 ACM/ICPC Asia Regional Shenyang Online