use proconio::{input, fastout};

#[fastout]
fn main() {
	input! {
		a: u32,
		b: u32,
	}
	
	println!("{}", output(solve(a, b)));
}

fn solve(a: u32, b: u32) -> u32 {
	const PRIMES: [u32; 25] = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97];
	let mut ans = 0;
	for p in PRIMES.into_iter().filter(|x| *x >= a && *x <= b) {
		ans += p * (p * (p - 1) + 1) + 1;
	}
	ans
}

fn output(ans: u32) -> u32 {
	ans
}