#include <iostream>

using namespace std;

int a, b, c;

int calc(int x)
{
	return x/10 + x%10;
}

int main(void)
{
	cin >> a >> b >> c;
	
	int ans = 1e9;
	for(int x = 1; x <= a+b*10; x++){
		for(int i = 0; i <= a; i++){
			for(int j = 0; j <= b; j++){
				if(i+j*10 < x) continue;
				if( (a+b) - (i+j) + calc(i+j*10-x) == c){
					cout << x << endl;
					return 0;
				}
			}
		}
	}
	cout << "Impossible" << endl;
	return 0;
}