#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main() {
    int a, b, c;
    cin>>a>>b>>c;
    for (int i = 1; i < 10000; i++)
        for (int j = 0; j <= a; j++)
            for (int k = 0; k <= b; k++) {
                int sum = j + 10*k;
                if (sum < i) continue;
                int change = sum - i;
                if (a-j + b-k + change/10 + change%10 == c) {
                    cout << i << endl;
                    return 0;
                }
            }
    cout << "Impossible\n";
    return 0;
}