import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int ans = Integer.MAX_VALUE / 2;
        for (int i = 1; i <= a + b * 10; i++) {
            for (int j = 0; j <= a; j++) {
                for (int k = 0; k <= b; k++) {
                    int value = j + 10 * k;
                    if (value == 0) {
                        continue;
                    }
                    if (getCount(value - i) + a - j + b - k == c) {
                        ans = Math.min(ans, i);
                    }
                }
            }
        }
        if (ans >= Integer.MAX_VALUE / 2) {
            System.out.println("Impossible");
        } else {
            System.out.println(ans);
        }
    }
    
    static int getCount(int x) {
        if (x < 0) {
            return Integer.MAX_VALUE / 2;
        } else {
            return x % 10 + x / 10;
        }
    }
}