#include <iostream>
using namespace std;
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  int g1, g10;

  g1 = 0;
  g1 = 0;
  int i = 1;
  int otsuri;
  while (true) {
    otsuri = a + (b * 10) - i;
    g1 = otsuri % 10;
    g10 = (otsuri - g1) / 10;

    if (c == g1 + g10) {
      cout << a + (b * 10) - otsuri;
      return 0;
    }
    if (otsuri == 0) {
      break;
    }
    i++;
  }

  cout << "Impossible" << endl;

  return 0;
}