#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

int main() {
  int a, b, c; cin >> a >> b >> c;
  int ans = 1e9;
  for (int i = 0; i <= a; i++) {
    for (int j = 0; j <= b; j++) {
      if (i == 0 && j == 0) continue;
      for (int k = 1; k <= a + 10 * b; k++) {
        int x = i + 10 * j - k;
        if (x < 0) continue;
        int n = x % 10;
        int m = x / 10;
        if (a - i + b - j + n + m == c) {
          //cout << i << ' ' << j << ' ' << k << ' ' << x << ' ' << n << ' ' << m << ' ' << i + 10 * j << endl;
          ans = min(ans, k);
        }
      }
    }
  }
  if (ans == 1e9) cout << "Impossible" << endl;
  else cout << ans << endl;
  return 0;
}