#[allow(unused)]
use proconio::{input, marker::Chars};
use std::collections::VecDeque;

fn main() {
    input! {
        s: String,
    }
    let mut ops = s
        .chars()
        .filter(|c| ['+', '*'].contains(&c))
        .collect::<VecDeque<_>>();
    let mut nums = s
        .split(&['+', '*'])
        .collect::<Vec<_>>()
        .iter()
        .map(|&c| c.to_string())
        .collect::<VecDeque<_>>();
    let mut result = nums.pop_front().unwrap().parse::<usize>().unwrap();
    while !nums.is_empty() {
        let op = ops.pop_front().unwrap();
        let rhs = nums.pop_front().unwrap().parse::<usize>().unwrap();
        if op == '+' {
            result *= rhs;
        } else {
            result += rhs;
        }
    }
    println!("{result}")
}