第一先判断素数,第二从该整数中间开始向两边遍历
public class Main{
public static void main(String[] args) { Scanner sc = new Scanner(System.in);
while(sc.hasNext()){
int a = sc.nextInt()/2;
for(int i=0;i<a;i++){
if(isS(a-i) && isS(a+i)){
System.out.println(a-i);
System.out.println(a+i);
break;
}
}
}
}
public static boolean isS(int a){
if(a==2 || a==3)return true;
for(int i=2;i<=a/2;i++){
if(a%i==0){
return false;
}
}
return true;
}
}