#include <bits/stdc++.h>
using namespace std;
int A,B,C;
int ans = -1;
int main() {
	cin >> A >> B >> C;
	int a = A;
	int b = B;
	while (a >= 0){
		for (int i = C; i >= 0; i--) {
			int t = C - i;
			if (t > b) break;
			if (i > a and i <= a + 9 and t < B and a == A) ans = max(ans, i + t * 10);
			else if (i > a) continue;
			else ans = max(ans, i + t * 10);
		}
		a -= 10;
		b += 1;
	}
	if (ans >= 0 and A + B * 10 - ans > 0) cout << A + B * 10 - ans << endl;
	else cout << "Impossible" << endl;
}