use proconio::input;
use std::io::{stdout,Write,BufWriter};

const BIG:usize = 1000000;
fn main() {
    input!{
        x:usize
    }

    let out = stdout();
    let mut out = BufWriter::new(out.lock());
    
    let mut z = x;
    for i in (2..=BIG).rev() {
        if z%(i*i) == 0 {
            z /= i*i;
            if z==1 {
                break;
            }
        }
    }
    write!(out, "{}", z).unwrap();
}