fn main() {
    let mut buf = String::new();
    let mut input = {
        use std::io::Read;
        std::io::stdin().read_to_string(&mut buf).unwrap();
        buf.split_whitespace()
    };

    let trick: u64 = input.next().unwrap().parse().unwrap();
    let treat: u64 = input.next().unwrap().parse().unwrap();

    let output = {
        let mut product = 1;
        for i in 1..=(trick | treat) {
            product *= i;
        }
        product
    };

    println!("{}", output);
}