#include <bits/stdc++.h>
#define rep(i,n) for(long long i=0;i<(n);++i)
using namespace std;
typedef long long ll;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int a, b, c;
	cin >> a >> b >> c;
	assert(0 <= a and a <= 20);
	assert(0 <= b and b <= 20);
	assert(0 <= c and c <= 100);
	for (int price = 1; price <= a + b * 10; price++) {
		for (int i = 0; i <= a; ++i) {
			for (int j = 0; j <= b; ++j) {
				const int pay = i + 10 * j;
				if (pay < price)continue;
				const int back = pay - price;
				const int pa = back % 10;
				const int pb = back / 10;
				const int coin = (a - i + pa) + (b - j + pb);
				if (coin == c) {
					cout << price << endl;
					return 0;
				}
			}
		}
	}
	cout << "Impossible" << endl;
	return 0;
}