#include <bits/stdc++.h> using namespace std; #include <math.h> #include <iomanip> #include <cstdint> #include <string> #include <sstream> #include <random> template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; } template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; } #define rep(i,n) for (int i = 0; i < (n); ++i) typedef long long ll; typedef unsigned long long ull; using P=pair<ll,ll>; const int INF=1001001001; const ll INFL=1e18; const int mod=1e9+7; void solve(){ ll n,m; cin>>n>>m; vector<ll>a(n); rep(i,n)cin>>a[i]; auto f=[&](ll mid){ ll mn=m*mid,r=0; rep(i,n){ if(a[i]+r<mn){ return false; } if(a[i]<mn){ ll need=mn-a[i]; r-=need; } if(a[i]>mn){ ll spill=a[i]-mn; r+=spill; } } return true; }; ll l=0,r=INF; while(r-l>1){ ll mid=(l+r)/2; if(f(mid)){ l=mid; } else{ r=mid; } } cout<<l<<endl; } int main(){ ios_base::sync_with_stdio(false); cin.tie(NULL); solve(); return 0; }