#include using namespace std; typedef long long ll; #define REP(i,n) for(int i=0; i #define VLL vector #define VVI vector> #define VVLL vector> #define VC vector #define VS vector #define VVC vector> #define VB vector #define VVB vector> #define fore(i,a) for(auto &i:a) typedef pair P; template bool chmax(T &a, T b) { if (a < b) { a = b; return true; } return false; } template bool chmin(T &a, T b) { if (a > b) { a = b; return true; } return false; } const int INF = 1 << 29; const ll INFL = 1LL << 60; const double pi = acos(-1); const ll mod = 1000000007; int main() { int a, b, c; cin >> a >> b >> c; int ans = INF; REP(i, a + 1) { REP(j, b + 1) { int k = i + j * 10; FOR(l,1, k + 1) { int cur = a + b - i - j; cur += (k - l) / 10; cur += (k - l) % 10; if (cur == c) { ans = min(ans, l); } } } } if (ans == INF) { cout << "Impossible" << endl; } else cout << ans << endl; }