#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> l_l;
typedef pair<int, int> i_i;

#define EPS (1e-7)
#define INF (1e9)
#define PI (acos(-1))
//const ll mod = 1000000007;

int main() {
    //cout.precision(10);
    cin.tie(0);
    ios::sync_with_stdio(false);
    int A, B, C;
    cin >> A >> B >> C;
    int ans = INF;
    for(int val = 1; val <= 300; val++) {
        for(int a = 0; a <= A; a++) {
            for(int b = 0; b <= B; b++) {
                if(a + b * 10 < val) continue;
                int retval = a + b * 10 - val;
                int retnum = retval / 10 + retval % 10;
                if(C == (A-a) + (B-b) + retnum) ans = min(ans, val);
            }
        }
    }
    if(ans == INF) cout << "Impossible" << endl;
    else cout << ans << endl;
    return 0;
}