-
Notifications
You must be signed in to change notification settings - Fork 7
Expand file tree
/
Copy pathMain.java
More file actions
41 lines (31 loc) · 703 Bytes
/
Copy pathMain.java
File metadata and controls
41 lines (31 loc) · 703 Bytes
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
package basicLevel1007;
import java.util.LinkedList;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int number = in.nextInt();
in.close();
LinkedList<Integer> prime = new LinkedList<Integer>();
for (int i = 2; i <= number; i++) {
if (isPrime(i)) {
prime.add(i);
}
}
int cnt = 0;
for (int i = 0; i < prime.size() - 1; i++) {
if (prime.get(i) - prime.get(i + 1) == -2) {
cnt++;
}
}
System.out.println(cnt);
}
public static boolean isPrime(int number) {
for (int i = 2; i <= Math.sqrt(number); i++) {
if (number % i == 0) {
return false;
}
}
return true;
}
}