fn main() {
    let stdin = std::io::stdin();
    let mut line = String::new();
    stdin.read_line(&mut line).unwrap();
    let line: Vec<&str> = line.split_whitespace().collect();
    let a = line[0].parse::<i32>().unwrap();
    let b = line[1].parse::<i32>().unwrap();
    let x = line[2].parse::<i32>().unwrap();
    println!("{}", (x + a - 1) / a * b);
}