use std::io::*;
use std::str::FromStr;

fn read<T: FromStr>() -> T {
    let stdin = stdin();
    let stdin = stdin.lock();
    let token: String = stdin
        .bytes()
        .map(|c| c.expect("failed to read char") as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect();
    token.parse().ok().expect("failed to parse token")
}

fn main() {
    let a = read::<u32>();
    let b = read::<u32>();
    let c = read::<u32>();

    match a + b == c || a + c == b || b + c == a {
        true => println!("YES"),
        false => println!("NO"),
    };
}
