#include <iostream>
using namespace std;
const int INF = 100000;
int main(){
	int A, B, C;
	cin >> A >> B >> C;
	int ans = INF;
	for (int i = 0; i <= A; i++){
		for (int j = 0; j <= B; j++){
			int c = i + j * 10;
			for (int k = 0; k < c; k++){
				if ((A - i + k % 10) + (B - j + k / 10) == C){
					ans = min(ans, c - k);
				}
			}
		}
	}
	if (ans == INF){
		cout << "Impossible" << endl;
	} else {
		cout << ans << endl;
	}
}