#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define int long long
using namespace std;
typedef pair<int, int> P;
const int mod = 1000000007;
const int INF = 1e18;

signed main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int a, b, c;
    cin >> a >> b >> c;
    for(int i = 1; i <= a + 10 * b; i++){
        for(int j = 0; j <= a; j++){
            for(int k = 0; k <= b; k++){
                int tmp = j + 10 * k - i;
                if(tmp < 0) continue;
                int ra = tmp % 10;
                int rb = tmp / 10;
                int sum = a + b - j - k + ra + rb;
                if(sum == c){
                    cout << i << endl;
                    return 0;
                }
            }
        }
    }
    cout << "Impossible" << endl;
}