fn main() {
    let mut x = String::new();
    std::io::stdin().read_line(&mut x).ok();
    let mut x: usize = x.trim().parse().unwrap();

    for i in 2..=(x as f64).sqrt() as usize {
        while x % (i * i) == 0 { x /= i * i; }
    }

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