fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let s = s.trim();

    let numbers: Vec<u64> = s.split(['+', '*']).map(|n| n.parse().unwrap()).collect();
    let ops: Vec<char> = s.chars().filter(|&c| c == '+' || c == '*').collect();

    let mut answer = numbers[0];

    for (o, n) in ops.iter().zip(&numbers[1..]) {
        match o {
            '+' => answer *= n,
            '*' => answer += n,
            _ => unreachable!(),
        }
    }

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