#![allow(non_snake_case, unused_imports)]

use std::cmp::{min, max};
use std::collections::{BinaryHeap, Bound, HashMap, HashSet, VecDeque};
use std::hash::Hash;
use std::ops::RangeBounds;
use ac_library::{Additive, Min, Segtree};
use proconio::{input, marker::Usize1, marker::Chars};
use itertools::Itertools;

#[allow(unused_macros)]
macro_rules! d {
    ( $( $x:expr ),* $(,)? ) => {
        eprintln!(
            concat!( $( stringify!($x), "={:?} " ),* ),
            $( $x ),*
        );
    };
}

#[allow(dead_code)]
fn yn(b: bool) -> &'static str {
    if b { "Yes" } else { "No" }
}

fn is_prime(n: i64) -> bool {
    if n <= 1 { return false }
    if n == 2 { return true }
    if n % 2 == 0 { return false }

    let mut i = 3;
    while i * i <= n {
        if n % i == 0 { return false }
        i += 2;
    }
    true
}

fn main() {
    input! {
        M: i64,
        D: i64,
    }

    let x = M * 100 + D;
    println!("{}", yn(is_prime(x)));
}