use regex::Regex;

fn main() -> std::io::Result<()> {
    let mut sum: u32 = 0;
    let re1 = Regex::new(r"(do\(\)|don't\(\)|mul\([0-9]*,[0-9]*\))").unwrap();
    let re2 = Regex::new(r"mul\(([0-9]*),([0-9]*)\)").unwrap();
    let hay = std::io::read_to_string(std::io::stdin()).unwrap();
    let mut i_do = true;
    for (_, [does]) in re1.captures_iter(&hay).map(|c| c.extract()) {
        if does == "do()" {
            i_do = true;
        } 
        if does == "don't()" {
            i_do = false;
        }
        if i_do {
            for (_, [num1, num2]) in re2.captures_iter(does).map(|c| c.extract()) {
                let num1: u32 = num1.parse().unwrap();
                let num2: u32 = num2.parse().unwrap();
                sum += num1 * num2;
            } 
        }
    }
    println!("{}", sum);
    Ok(())
}