哎呀难过死了

#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
typedef unsigned long long ll;
inline int read(){
	int x=0,f=1;
	char ch=getchar();
	while(ch<'0'||ch>'9'){
		if(ch=='-')f=-1;
		ch=getchar();
	}
	while(ch>='0'&&ch<='9'){
		x=x*10+ch-'0';
		ch=getchar();
	}
	return x*f;
}
ll n,m,ans,a[1000006],r;
ll check(ll k){
	ll sum=0;
	for(int i=1;i<=n;i++)
		if(a[i]>k)sum+=a[i]-k;
	if(sum>m)return 2;
	if(sum<m)return 0;
	if(sum==m)return 1;
}
void solve(ll l,ll r){
	ll i=l,j=r,mid=(l+r+1)/2;
	ll t=check(mid);
	if(t==2)
		solve(mid+1,j);
	else{
		if(t==0)
			solve(i,mid-1);
		else{
			ans=mid;
			return;
		}
	}
}
int main(){
	n=read();m=read();
	for(int i=1;i<=n;i++){
		a[i]=read();
		r=r>a[i]?r:a[i];
	}
	solve(0,r);
	cout<<ans;
	return 0;
}