F

https://vjudge.net/contest/218366

Java解

import java.math.BigInteger;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner cin = new Scanner(System.in);
        BigInteger a = cin.nextBigInteger();
        Boolean b = a.isProbablePrime(1);
        if(b == true)
            System.out.println("Yes");
        else
            System.out.println("No");
        cin.close();
    }
}