#include <bits/stdc++.h>

using namespace std;

const int MAXN = 1e5 + 10;

unsigned long long n, k, a[MAXN], mins = 1e18, b[MAXN];

bool F(unsigned long long x){
  for(int i = 1; i <= n; i++){
    if(a[i] < x){
      b[i] = x - a[i];
    } else {
      b[i] = 0;
    }
  }
  unsigned long long xx = 0, s = 0;
  for(int i = 1; i <= n; i++){
    if(b[i]){
      if(b[i] > s){
        xx += (b[i] + i - s - 1) / i;
        s += (b[i] + i - s - 1) / i * i;
      }
    }
  }
  return xx <= k;
}

int main(){
  cin >> n >> k;
  for(int i = 1; i <= n; i++){
    cin >> a[i];
    mins = min(mins, a[i]);
  }
  unsigned long long l = 0, r = mins + k * n;
  while(l < r){
    unsigned long long mid = (l + r + 1) >> 1;
    if(F(mid)){
      l = mid;
    } else {
      r = mid - 1;
    }
  }
  cout << l;
  return 0;//
}