use std::io::Read;
use std::collections::HashSet;

fn main() {
    let mut all_data = String::new();
    std::io::stdin().read_to_string(&mut all_data).ok();
    let abc: Vec<usize> = all_data.trim().split('\n').next().unwrap().trim().split_whitespace()
        .map(|s| s.parse().unwrap())
        .collect();
    let a = abc[0];
    let b = abc[1];
    let c = abc[2];
    let amount = a + 10*b;
    let mut uses: HashSet<usize> = HashSet::new();
    for i in 1..=amount {
        if a >= i % 10 {
            // smart
            if b >= i / 10 {
                if b - i / 10 + a - i % 10 == c {
                    uses.insert(i);
                }
            }
            // 1 -> 10
            if a - i % 10 >= 10 {
                if b + a - i / 10 - i % 10 - 9 == c {
                    uses.insert(i);
                }
            }
            // 10 -> 1
            if b > i / 10 {
                if b - i / 10 - 1 + a + 10 - i % 10 == c {
                    uses.insert(i);
                }
            }
        }
    }
    if uses.is_empty() {
        println!("Impossible");
    } else {
        println!("{}", uses.iter().min().unwrap());
    }
}