Solution

1.7.10.java

import java.util.Scanner;

/**
 * Created by evjeny
 */
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int a = scanner.nextInt();
        a += (a%2==0?1:2);
        while(true) {
            if(iss(a)) {
                print(a);
                break;
            }
            a+=2;
        }
    }
    private static boolean iss(int todo) {
        boolean sm = true;
        int len = todo/2;
        for(int i = 1; i<=len; i+=2) {
            if(i!=1&&todo%i==0) {
                sm = false;
                break;
            }
        }
        return sm;
    }

    private static void print(Object todo) {
        System.out.print(todo);
    }
}