#include <algorithm>
#include <bitset>
#include <cassert>
#include <cctype>
#include <chrono>
#define _USE_MATH_DEFINES
#include <cmath>
#include <cstdio>
#include <cstring>
#include <ctime>
#include <deque>
#include <functional>
#include <iostream>
#include <iterator>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <string>
#include <tuple>
#include <utility>
#include <vector>
using namespace std;

#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()

const int INF = 0x3f3f3f3f;
const long long LINF = 0x3f3f3f3f3f3f3f3fLL;
const double EPS = 1e-8;
const int MOD = 1000000007; // 998244353;
const int dy[] = {1, 0, -1, 0}, dx[] = {0, -1, 0, 1};
/*-------------------------------------------------*/
int main() {
  cin.tie(0); ios::sync_with_stdio(false);
  // freopen("input.txt", "r", stdin);

  int a, b, c; cin >> a >> b >> c;
  FOR(i, 1, a + 10 * b + 1) {
    REP(one, a + 1) REP(two, b + 1) {
      if (one + 10 * two < i) continue;
      int money = (one + 10 * two) - i, cnt = a - one + b - two;
      cnt += money / 10;
      money %= 10;
      cnt += money;
      if (cnt == c) {
        cout << i << '\n';
        return 0;
      }
    }
  }
  cout << "Impossible\n";
  return 0;
}