use std::collections::{BTreeSet, HashMap, HashSet};

use proconio::marker::Chars;

fn main() {
    proconio::input! {
        s: Chars,
    }
    let op_indexes = s
        .iter()
        .enumerate()
        .filter(|(_, c)| !c.is_numeric())
        .map(|(i, _)| i)
        .collect::<Vec<_>>();
    let mut values: Vec<i64> = vec![];
    let mut i = 0;
    for &op_index in op_indexes.iter() {
        values.push(s[i..op_index].iter().collect::<String>().parse().unwrap());
        i = op_index + 1;
    }
    values.push(s[i..].iter().collect::<String>().parse().unwrap());
    eprintln!("{:?}", values);
    let mut ans = values[0];
    for (i, op) in op_indexes
        .into_iter()
        .map(|op_index| s[op_index])
        .enumerate()
    {
        match op {
            '+' => ans *= values[i + 1],
            '*' => ans += values[i + 1],
            _ => unreachable!(),
        }
    }
    println!("{}", ans);
}