#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pii pair<int, int>
#define eb emplace_back
#define all(v) v.begin(), v.end()
#define rep(i, n) for (int i = 0; i < n; ++i)
#define rep3(i, l, n) for (int i = l; i < n; ++i)
#define chmax(a, b) a = max(a, b)
#define chmin(a, b) a = min(a, b)
#define out(a) cout << a << endl
#define SZ(v) (int)v.size()
#define inf (int)(1e9+7)

int main() {
    //入力の制約を見れば10^100とかいう数字はフェイク
    int a, b, c; cin >> a >> b >> c;
    int ans = inf;
    rep3(i, 1, a + 10 * b + 1) rep(j, a + 1) rep(k, b + 1) {
        if (j == 0 && k == 0) continue;
        int pay = j + 10 * k;
        if (pay - i < 0) continue;
        int change = pay - i;
        if (a + b - j - k + change / 10 + change % 10 != c) continue;
        //out(i << " " << j << " " << k);
        chmin(ans, i);
    }
    if (ans == inf) out("Impossible");
    else out(ans);
}