#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <array>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
#include <memory>
#include <regex>
using namespace std;

int main()
{
    int a, b, c;
    cin >> a >> b >> c;

    for(int val=1; val<=10*b+a; ++val){
        for(int x=0; x<=a; ++x){
            for(int y=0; y<=b; ++y){
                int rest = 10 * y + x - val;
                if(rest < 0)
                    continue;

                int z = a + b - x - y + rest / 10 + rest % 10;
                if(z == c){
                    cout << val << endl;
                    return 0;
                }
            }
        }
    }

    cout << "Impossible" << endl;
    return 0;
}