### PrimePrime count sieve of Eratosthenes.

this problem is from codefights.
https://codefights.com/challenge/doXskkj8PMAJ27Epk/main

try to find prime numbers by using  sieve of Eratosthenes.
and count luckyprimeprime.

I think this is not difficult though.

``` int c, t, s, i;
int luckyandprimeprime(int l, int r) {
int[] p = new int[100001];

s = p.length;
for ( i = 2; i < s; i++, t=0)
while ((t += i) < s)
p[t]++;

for (i = 0; i < l; i++)
if (p[i] == 1)
c++;

for (i = l; i <= r; i++) {
if (p[i] == 1)
c++;

if (p[c] == 1)
t++;
}
return t;
}```

Recently Lucky learnt how to check if the given number is prime or not. Bunny, Lucky's friend, decided to give her a task to test her skills.
Let's call number `P` Prime Prime if the number of prime numbers in the range `[1, P]` is prime. Bunny asked Lucky to calculate the number of Prime Prime numbers in the range `[l, r]`. Can you you help her?
Example
For `l = 1` and `r = 10`, the output should be
`luckyandprimeprime(l, r) = 4`.
There're `4` prime numbers in the given range: `2``3``5` and `7`. Thus, Prime Prime numbers are `3``4``5`and `6``4` numbers altogether.
Input/Output
• [time limit] 3000ms (java)
• [input] integer l
Constraints:
`1 ≤ l ≤ r`.
• [input] integer r
Constraints:
`l ≤ r ≤ 105`.
• [output] integer
The number of Prime Prime numbers in the range `[l, r]`.

Recently Lucky learnt how to check if the given number is prime or not. Bunny, Lucky's friend, decided to give her a task to test her skills.
Let's call number `P` Prime Prime if the number of prime numbers in the range `[1, P]` is prime. Bunny asked Lucky to calculate the number of Prime Prime numbers in the range `[l, r]`. Can you you help her?
Example
For `l = 1` and `r = 10`, the output should be
`luckyandprimeprime(l, r) = 4`.
There're `4` prime numbers in the given range: `2``3``5` and `7`. Thus, Prime Prime numbers are `3``4``5`and `6``4` numbers altogether.
Input/Output
• [time limit] 3000ms (java)
• [input] integer l
Constraints:
`1 ≤ l ≤ r`.
• [input] integer r
Constraints:
`l ≤ r ≤ 105`.
• [output] integer
The number of Prime Prime numbers in the range `[l, r]`.