https://codeforces.com/contest/1111/problem/B

/*
*@Author:   STZG
*@Language: C++
*/
#include <bits/stdc++.h>
#include<iostream>
#include<algorithm>
#include<cstdlib>
#include<cstring>
#include<cstdio>
#include<string>
#include<vector>
#include<bitset>
#include<queue>
#include<deque>
#include<stack>
#include<cmath>
#include<list>
#include<map>
#include<set>
//#define DEBUG
#define RI register int
using namespace std;
typedef long long ll;
//typedef __int128 lll;
const int N=100000+10;
const int MOD=1e9+7;
const double PI = acos(-1.0);
const double EXP = 1E-8;
const int INF = 0x3f3f3f3f;
int t,n,m,k,q;
ll ans,cnt,flag,temp,sum;
int a[N];
int add[N];
char str;
int main()
{
#ifdef DEBUG
	freopen("input.in", "r", stdin);
	//freopen("output.out", "w", stdout);
#endif
    scanf("%d%d%d",&n,&k,&m);
    //scanf("%d",&t);
    //while(t--){}
    for(int i=1;i<=n;i++){
        scanf("%d",&a[i]);
        sum+=a[i];
    }
    sort(a+1,a+n+1);
    int l=1;
    int r=n;
    while(m--&&l<=r){
        if(l<r&&a[l]==a[r]&&n-l+1<=m){
            sum-=a[l];
            l++;
            continue;
        }
        if(l==r){
            if(add[r]<k){
                add[r]++;
                a[r]++;
                if(add[r]==k)
                    r--;
                sum++;

            }
            continue;
        }//cout << (double)(sum-a[l])/(n-l)<<" "<<(sum+1)/(double)(n-l+1)<< endl;
        if((sum-a[l])/(double)(n-l)>(sum+1)/(double)(n-l+1)){
            sum-=a[l];
            l++;
        }else{
            add[r]++;
            a[r]++;
            if(add[r]==k)
                r--;
            sum++;
        }
    }
    printf("%.12lf\n",(double)sum/(n-l+1));
    //
    //cout << "Hello world!" << endl;
    return 0;
}