fn main() {
    let s = getline();
    let al:Vec<_>=s.trim().split(' ').collect();
    let a:i32 = al[0].parse().unwrap();
    let b:i32 = al[0].parse().unwrap();
    let x:i32 = al[0].parse().unwrap();
    let ans = if x%a == 0 {
        x/a
    }else{
        (x/a)+1
    };
    println!("{}",ans*b);
}

fn getline() -> String {
    let mut _ret = String::new();
    std::io::stdin().read_line(&mut _ret).ok();
    return _ret;
}