#include <bits/stdc++.h>
#define PI 3.14159265359
#define MAX 10000
#define NIL -1
using namespace std;
const int64_t MOD = 1e9 + 7;

int main() {
	int A, B, C;
	cin >> A >> B >> C;

	for (int i = 0; i < A + B * 10; i++) {
		for (int j = 0; j <= A; j++) {
			for (int k = 0; k <= B; k++) {
				int p = A + B * 10;
				int a, b;
				a = j;
				b = k;
				if (p < i) continue;

				if (p > i) {
					a -= (p - i) % 10;
					b -= (p - i) / 10;
					
				}

				int n = A + B - a - b;
				if (n == C) {
					cout << i << endl;
					return 0;
				}
			}
		}
	}

	cout << "Impossible" << endl;
}