#include <bits/stdc++.h>
using namespace std;
using lint = long long;
template<class T = int> using V = vector<T>;
template<class T = int> using VV = V< V<T> >;

int main() {
  cin.tie(nullptr); ios::sync_with_stdio(false);
  int a, b, c; cin >> a >> b >> c;
  for (int x = 1; x <= a + 10 * b; ++x) {
    for (int i = 0; i <= a; ++i) for (int j = 0; j <= b; ++j) {
      if (i + 10 * j < x) continue;
      int r = i + 10 * j - x;
      int p = r / 10, q = r % 10;
      if (a - i + b - j + p + q == c) return cout << x << '\n', 0;
    }
  }
  cout << "Impossible" << '\n';
}