fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}
fn main() {
  let abc:Vec<i64> = read_vec();
  let a = abc[0];
  let b = abc[1];
  let c = abc[2];

  let have = a + b * 100;

  let mut ans = None;
  for a_use in 0i64..=a {
    let a_money = a_use;
    for b_use in 0i64..=b {
      let b_money = b_use * 10;
      for price in 1..=have {
        let rest = price - a_money - b_money;
        if rest <= 0 {
          let t = rest.abs() / 10 + rest.abs() % 10;
          if a + b - a_use - b_use + t == c {
            if ans.is_none() {
              ans = Some(a_money+b_money+rest);
            } else if ans.unwrap() > a_money+b_money+rest {
              ans = Some(a_money+b_money+rest);
            }
          }
        }
      }
    }
  }
  if let Some(ans) = ans {
    println!("{:?}", ans);
  } else {
    println!("Impossible");
  }
}