macro_rules! input {
  ($($x:ident : $t:ty), *) => {
    $(let $x: $t;)*
    {
      let mut s = String::new();
      std::io::stdin().read_line(&mut s).unwrap();
      let mut it = s.trim().split_whitespace();
      $($x = it.next().unwrap().parse().unwrap();)*
      assert!(it.next().is_none());
    }
  };
}

fn check(a: i64, b: i64) -> bool {
  if b == 0 { return false }
  return a * b / b != a
}

fn main() {
  input!(a: i64, b: i64, c: i64);

  let mut ok: i64 = c;
  let mut ng: i64 = 0;

  while ok - ng > 1 {
    let mid = (ok + ng) / 2;

    if check(b - 1, mid / a) {
      ok = mid;
    } else if (b-1)*(mid/a) >= c-mid {
      ok = mid;
    } else {
      ng = mid;
    }
  }

  println!("{}", ok);
}