fn main() {
    let stdin = std::io::read_to_string(std::io::stdin()).unwrap();
    let mut stdin = stdin.split_ascii_whitespace();

    let a: u16 = stdin.next().unwrap().parse().unwrap();
    let b: u16 = stdin.next().unwrap().parse().unwrap();
    let c: u16 = stdin.next().unwrap().parse().unwrap();

    println!("{:>.06}", output(solve(a, b, c)));
}

fn solve(a: u16, b: u16, c: u16) -> f32 {
    (a as u32 * c as u32) as f32 / b as f32
}

fn output(ans: f32) -> f32 {
    ans
}