#include <cstdio> #include <iostream> #include <sstream> #include <fstream> #include <iomanip> #include <algorithm> #include <cmath> #include <string> #include <vector> #include <list> #include <queue> #include <stack> #include <set> #include <map> #include <bitset> #include <numeric> #include <limits> #include <climits> #include <cfloat> #include <functional> using namespace std; int main() { int n, k; cin >> n >> k; vector<int> a(n); for(int i=0; i<n; ++i) cin >> a[i]; sort(a.begin(), a.end()); int ret = 0; int sum = 0; for(int i=0; i<=n-k; ++i){ sum += a[i]; ret = max(ret, (a[n-1] * (i + 1) - sum) / (i + 1)); } cout << ret << endl; return 0; }