#include <bits/stdc++.h>
#define range(i, n) for(int (i) = 0; (i) < (n); (i)++)
#define reversed_range(i, n) for (int (i) = (n) - 1; (i) >= 0; (i)--)
using namespace std;
template <typename T>
using vec = vector<T>;
using lint = long long;
using ulint = unsigned long long;

template <typename T>
ostream& operator <<(ostream& os, vec<T> v) {
    os << "[";
    for (int i = 0; i < v.size() - 1; i++) {
        os << v.at(i) << ", ";
    }
    return os << v.at(v.size() - 1) << "]";
}


const int INF = (1 << 29) - 1;
int main() {
    int A, B, C;
    cin >> A >> B >> C;
    int min_cost = INF;
    for (int num_ones = 0; num_ones <= A; num_ones++) {
        for (int num_tens = 0; num_tens <= B; num_tens++) {
            int sum_value = num_ones + 10 * num_tens;
            for (int cost = sum_value; cost > 0; cost--) {
                int rest = sum_value - cost;
                int num_coins = (A - num_ones) + (B - num_tens) + (rest / 10) + (rest % 10);
                if (num_coins == C) {
                    min_cost = min(min_cost, cost);
                }
            }
        }
    }
    if (min_cost < INF) cout << min_cost << "\n";
    else cout << "Impossible" << "\n";
}