#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>
using namespace std;
#define rep(i, x, limit) for (long long i = (long long)x; i < (long long)limit; i++)
#define REP(i, x, limit) for (long long i = (long long)x; i <= (long long)limit; i++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define el '\n'
#define spa " "
#define Yes cout << "Yes" << el
#define No cout << "No" << el
#define YES cout << "YES" << el
#define NO cout << "NO" << el
#define inp(x) for(auto &i:x)cin>>i
#define eps (1e-10)
#define Equals(a,b) (fabs((a) - (b)) < eps )
#define debug(x) cerr << #x << " = " << x << el
using ll = long long;
using ull = unsigned long long;
using i128 = __int128_t;
using boost::multiprecision::cpp_int;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
using vi = vector<int>;
using vl = vector<ll>;
using vvl = vector<vector<ll>>;
using vs = vector<string>;
using vb = vector<bool>;
const double pi = 3.141592653589793238;
const int inf = 1073741823;
const ll infl = 1LL << 60;
const string ABC = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const string abc = "abcdefghijklmnopqrstuvwxyz";
const ll MOD = 998244353;
#include<atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using vm = vector<mint>;
vl CC(vl &A,ll x){
  ll n=A.size();
  vl C(n,-1);
  ll l=-1;
  ll now=0;
  rep(i,0,n){
    now=A[i];
    if(now<x)continue;
    while(l+1<i&&now-A[l+1]>=x){
      l++;
    }
    C[i]=l+1;
  }
  rep(i,1,n){
    if(C[i-1]==-1)continue;
    C[i]=max(C[i],C[i-1]+1);
  }
  return C;
}
vl RCC(vl &A,ll x,ll l){
  vl B=A;
  reverse(all(B));
  for(auto &b:B)b=l-b;
  auto C=CC(B,x);
  reverse(all(C));
  return C;
}
bool Check(vl A,ll x,ll l,ll k){
  auto B=CC(A,x);
  auto C=RCC(A,x,l);
  rep(i,0,A.size()){
    if(B[i]>=0&&C[i]>=0&&B[i]+C[i]+1>=k)return true;
  }
  return false;
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  ll n,l,k;cin>>n>>l>>k;
  vl A(n);inp(A);
  debug(Check(A,4,l,k));
  ll y=1,z=l+1;
  while(z-y>1){
    ll m=(y+z)/2;
    if(Check(A,m,l,k))y=m;
    else z=m;
  }
  cout<<y<<el;
}