#include "bits/stdc++.h"
using namespace std;

int main() {
	long long A, B, C;
	cin >> A >> B >> C;
	for (int i = 1; i <= A + B * 10; i++) {
		for (int j = 0; j <= A; j++) {
			for (int k = 0; k <= B; k++) {
				if (j + k * 10 < i) continue;
				int l = j + k * 10 - i;
				int x = A - j + l % 10;
				int y = B - k + l / 10;
				if (x + y == C) {
					cout << i << endl;
					return 0;
				}
			}
		}
	}
	cout << "Impossible" << endl;
}