#include <iostream>
int main()
{
    std::size_t A, B, C;
    std::cin >> A >> B >> C;
    const std::size_t M = A + B * 10;
    for (std::size_t i = 1; i <= M; i++) {
        for (std::size_t a = 0; a <= A; a++) {
            for (std::size_t b = 0; b <= B; b++) {
                const std::size_t P = a + b * 10;
                if (i > P) { continue; }
                const std::size_t pb = (P - i) / 10, pa = (P - i) % 10;
                const std::size_t N = (A - a) + (B - b) + pa + pb;
                if (N == C) { return std::cout << i << std::endl, 0; }
            }
        }
    }
    std::cout << "Impossible" << std::endl;
    return 0;
}