#ifdef _DEBUG
#include "MyLib.h"
#else
#define main_A main
#include "bits/stdc++.h" 
#include <regex>
#define _USE_MATH_DEFINES
#include <math.h>
#define FOR(i,s,e) for (int i = int(s); i < int(e); ++i)
#define REP(i,e) FOR(i,0,e)
#define INF (INT_MAX/2)
#define EPS (1.0e-8)
#define LINF (LONG_MAX/2)
const int MGN = 8;
const int ARY_SZ_MAX = 10000000;
using namespace std;
using ll = long long; using ull = unsigned long long;
using vi = vector<int>; using vvi = vector<vi>; using vvvi = vector<vvi>;
using vb = vector<bool>; using vvb = vector<vb>; using vvvb = vector<vvb>;
using vl = vector<ll>; using vvl = vector<vl>;
using vd = vector<double>; using vs = vector<string>;
using pii = pair<int, int>; using pll = pair<ll, ll>;
// functions

#endif


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

    int A, B, C;  cin >> A >> B >> C;

    int ans = -1;
    int M = 10 * B + A;
    bool found = false;
    FOR(p, 1, M+1) {
        REP(i, B+1) {
            REP(j, A+1) {
                if (10 * i + j < p) continue;

                int change = (10 * i + j) - p;
                int cnt = 0;
                if (change > 0) cnt = change / 10 + change % 10;

                int n = B - i + A - j + cnt;
                if (n == C) {
                    ans = p;
                    found = true;
                    break;
                }
            }
            if (found) break;
        }
        if (found) break;
    }
    
    if (ans < 0) cout << "Impossible" << endl;
    else cout << ans << endl;

    return 0;
}