#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <cmath>
#include <iomanip>
#include <stack>
#include <queue>
#include <numeric>
#include <map>
#include <unordered_map>
#include <set>
#include <fstream>
#include <chrono>
#include <random>
#include <bitset>
//#include <atcoder/all>
#define rep(i,n) for(int i=0;i<(n);i++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) ((int)(x).size())
#define pb push_back
using ll = long long;
using namespace std;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
ll gcd(ll a, ll b) {return b?gcd(b,a%b):a;}
ll lcm(ll a, ll b) {return a/gcd(a,b)*b;}

int main(){
  int A,B,C; cin >> A >> B >> C;
  for(int i=1;i<=A+B*10;i++){
    for(int a=0;a<=A;a++){
      for(int b=0;b<=B;b++){
        int p = a+b*10;
        if(p<i) continue;
        int l = p-i;
        if(A-a+B-b+l/10+l%10==C){
          cout << i << endl;
          return 0;
        }
      }
    }
  }
  cout << "Impossible" << endl;
  return 0;
}