#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 < n * k) { cout << "Impossible"; return; } vector<int> a; a.pb(0); for(int i = 0 ; i < n; i++) { int x; cin >> x; a.pb(x); } vector<int> b; b.pb(0); for(int i = 0; i < m; i++) { int x; cin >> x; b.pb(x); } sort(a.begin(), a.end()); sort(b.begin(), b.end()); int ans = 0; for(int i = 0; i < n; i++) { int l = 1, r = b.size(); while(l < r) { int mid = l + r / 2; if(b[mid] >= a[i]) r = mid; else l = mid + 1; } if(b[l] >= a[i]) { ans += b[l] - a[i]; vector<int> c; for(int j = 0; j < b.size(); j++) if(b[i] != b[l]) c.pb(b[i]); b.clear(); b = c; continue; } cout << "Impossible"; return; } cout << ans; } 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~ ┗━━━━━━━━━━━━┛ */