#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long double;

const double PI = 3.1415926535897932384626433832795;
const ll MOD = 1000000007;

const int dx[] = { 0, 1, 0, -1 };
const int dy[] = { -1, 0, 1, 0 };

int gcd(int x, int y) { return y ? gcd(y, x % y) : abs(x); }
ll gcd(ll x, ll y) { return y ? gcd(y, x % y) : abs(x); }
int lcm(int x, int y) { return x / gcd(x, y) * y; }
ll lcm(ll x, ll y) { return x / gcd(x, y) * y; }

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	int a, b, c;
	cin >> a >> b >> c;

	for (int price = 1; price <= a + 10 * b; price++) {
		for (int aCnt = 0; aCnt <= a; aCnt++) {
			for (int bCnt = 0; bCnt <= b; bCnt++) {
				int buy = aCnt + 10 * bCnt;

				if (buy < price) {
					continue;
				}

				int change = buy - price;
				int mod1 = change % 10;
				int mod10 = change / 10;

				int coin = (a - aCnt + mod1) + (b - bCnt + mod10);

				if (coin == c) {
					cout << price << endl;
					return 0;
				}
			}
		}
	}

	cout << "Impossible" << endl;
	return 0;
}