#include <bits/stdc++.h>


using namespace std;
typedef long long ll;
#define REP(i,n) for(int i=0; i<int(n); i++)
#define FOR(i,m,n) for(int i=int(m); i<int(n); i++)
#define ALL(obj) (obj).begin(),(obj).end()
#define VI vector<int>
#define VLL vector<long long>
#define VVI vector<vector<int>>
#define VVLL vector<vector<long long>>
#define VC vector<char>
#define VS vector<string>
#define VVC vector<vector<char>>
#define VB vector<bool>
#define VVB vector<vector<bool>>
#define fore(i,a) for(auto &i:a)

typedef pair <int, int> P;
template<class T> bool chmax(T &a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> bool chmin(T &a, T b) { if (a > b) { a = b; return true; } return false; }
const int  INF = 1 << 29;
const ll INFL = 1LL << 60;
const double pi = acos(-1);
const ll mod = 1000000007;






int main() {

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

	int ans = INF;
	REP(i, a + 1) {
		REP(j, b + 1) {
			int k = i + j * 10;
			FOR(l,1, k + 1) {
				int cur = a + b - i - j;
				cur += (k - l) / 10;
				cur += (k - l) % 10;
				if (cur == c) {
					ans = min(ans, l);
				}
			}
		}
	}
	if (ans == INF) {
		cout << "Impossible" << endl;
	}
	else cout << ans << endl;

}