#include<iostream>
#include<iomanip>
#include<vector>
#include<algorithm>
#include<set>
#include<map>
#include<unordered_map>
#include<stack>
#include<queue>
#include<math.h>
#include<functional>
#include<bitset>
#include<cassert>
using namespace std;
using lint = long long;
using ld = long double;
using pint = pair<int, int>;
using plint = pair<lint, lint>;
#define MOD 1000000007LL
#define INF 1000000000LL
#define EPS 1e-10
#define FOR(i,n,m) for(lint i=n;i<(int)m;i++)
#define REP(i,n) FOR(i,0,n)
#define DUMP(a) REP(d,a.size()){cout<<a[d];if(d!=a.size()-1)cout<<" ";else cout<<endl;}
#define ALL(v) v.begin(),v.end()
#define UNIQUE(v)  sort(ALL(v));v.erase(unique(ALL(v)),v.end());
#define pb push_back

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int a, b, c;
	cin >> a >> b >> c;
	lint ans = INF * INF;
	FOR(i, 1, 10 * b + a + 1) {
		REP(j, a + 1) REP(k, b + 1) {
			int diff = 10 * k + j - (10 * b + a);
			if(diff < 0) continue;
			int rem = (a - j) + (b - k) + diff / 10 + diff % 10;
			if(rem == c) ans = min(ans, i);
		}
	}
	if(ans = INF * INF) cout << "Impossible" << endl;
	else cout << ans << endl;
	return 0;
}
/* --------------------------------------- */