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

#[allow(dead_code)]
fn get_line() -> String {
    let stdin = stdin();
    let mut line = String::new();
    stdin.lock().read_line(&mut line).expect("io error.");
    line.trim().to_string()
}

#[allow(dead_code)]
fn cast<T: FromStr>(s: &str) -> T {
    s.parse().ok().expect("parse error.")
}

#[allow(dead_code)]
fn get_vec<T: FromStr>() -> Vec<T> {
    (&get_line()).split(' ').map(cast::<T>).collect()
}


/* ---------- ここまでテンプレ ---------- */


fn main() {
    let mut s = get_line();
    s += "+";

    let mut ans: u64 = 0;
    let mut buf = String::new();
    let mut pre: char = '*';

    for c in s.chars() {
        if c.is_digit(10) {
            buf.push(c);
        } else {
            let num: u64 = cast(&buf);
            match pre {
                '+' => {ans *= num;},
                '*' => {ans += num;},
                _   => {panic!();},
            };

            pre = c;
            buf.clear();
        }
    }

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