fn main() {
    let mut vtp = String::new();
    std::io::stdin().read_line(&mut vtp).ok();
    let vtp: Vec<usize> = vtp.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let v = vtp[0];
    let t = vtp[1];
    let p = vtp[2];

    let mut result = (p + 1) * v;
    let mut behind: usize = 0;
    let mut times = (result - 1) / t + if (result - 1) % t > 0 { 1 } else { 0 };
    result += times;
    if (result - 1) % t == 0 { result += 1; }
    behind = t - (result - 1) % t;
    while times > 0 && times > behind {
        times = (times - behind) / t + if (times - behind) % t > 0 { 1 } else { 0 };
        if (result - 1) % t == 0 { result += 1; }
        result += times;
        behind = t - (result - 1) % t;
    }
    println!("{}", result);
}