#include <cstdlib>
#include <iostream>
#include <vector>
using ll = long long;
using namespace std;
#define _overload3(_1, _2, _3, name, ...) name
#define _rep(i, n) repi(i, 0, n)
#define repi(i, a, b) for(int i = int(a); i < int(b); ++i)
#define rep(...) _overload3(__VA_ARGS__, repi, _rep, )(__VA_ARGS__)

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