#include <bits/stdc++.h>

using namespace std;

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

const double PI = acos(-1);
const int INF = 1<<30;

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int a, b, c;
  cin >> a >> b >> c;

  int ret = INF;
  for (int t = 1; t <= a + 10 * b; t++) {
    for (int i = 0; i <= a; i++) {
      for (int j = 0; j <= b; j++) {
        if (i + 10*j < t) continue;
        int rm = (i + 10*j) - t;
        if (a-i+rm%10 + b-j+rm/10 == c)
          ret = min(ret, t);
      }
    }
  }

  if (ret == INF)
    cout << "Impossible" << endl;
  else
    cout << ret << endl;
  
  return 0;
}