#include <bits/stdc++.h> #define ll long long #define to_str to_string #define pb push_back #define pp pop_back using namespace std; void code() { int n, m, k; cin >> n >> m >> k; if(m < k) { cout << "Impossible"; return; } int sum = 0; for(int i = 0; i < n; i++) { int x; cin >> x; sum+=x; } vector<int> a; for(int i = 0; i < m; i++) { int x; cin >> x; a.pb(x); } if(k == 1) { if(m == 1) { if(a[0] >= sum) { cout << a[0] - sum; } else { cout << "Impossible"; } } else { if(a[0] >= sum) cout << a[0] - sum; else if(a[1] >= sum) cout << a[1] - sum; else if(a[1] + a[0] >= sum) cout << a[1] + a[0] - sum; else cout << "Impossible"; } } else { if(a[0] + a[1] >= sum) { cout << a[0] + a[1] - sum; } else { cout << "Impossible"; } } } int main() { ios_base::sync_with_stdio(false); cout.tie(0); cin.tie(0); // freopen(".in", "r", stdin); // freopen(".out", "w", stdout); int t = 1; // cin >> t; for(int i = 0; i < t; i++) code(); return 0; } /* /)/)~┏━━━━━━━━━━━━┓ (•-•)~ ♡ осторожно важный код ♡ /づづ~ ┗━━━━━━━━━━━━┛ */