Kvass and the Fair Nut（思路+数学）

The Fair Nut likes kvass very much. On his birthday parents presented him nn kegs of kvass. There are vivi liters of kvass in the ii-th keg. Each keg has a lever. You can pour your glass by exactly 11 liter pulling this lever. The Fair Nut likes this drink very much, so he wants to pour his glass by ss liters of kvass. But he wants to do it, so kvass level in the least keg is as much as possible.

Help him find out how much kvass can be in the least keg or define it's not possible to pour his glass by ss liters of kvass.

Input

The first line contains two integers nn and ss (1≤n≤1031≤n≤103, 1≤s≤10121≤s≤1012) — the number of kegs and glass volume.

The second line contains nn integers v1,v2,…,vnv1,v2,…,vn (1≤vi≤1091≤vi≤109) — the volume of ii-th keg.

Output

If the Fair Nut cannot pour his glass by ss liters of kvass, print −1−1. Otherwise, print a single integer — how much kvass in the least keg can be.

Examples

Input

3 3
4 3 5

Output

3

Input

3 4
5 3 4

Output

2

Input

3 7
1 2 3

Output

-1

Note

In the first example, the answer is 33, the Fair Nut can take 11liter from the first keg and 22 liters from the third keg. There are 33 liters of kvass in each keg.

In the second example, the answer is 22, the Fair Nut can take 33 liters from the first keg and 11 liter from the second keg.

In the third example, the Fair Nut can't pour his cup by 77liters, so the answer is −1−1.

给出n个装满液体的罐子，和一个杯子的容积。问把杯子倒满后，求剩余液体最少的杯子中液体的体积。关键的一句是要保证剩余液体最少的杯子的液体体积要尽可能大。从数学的角度来看，就是求平均值，如果最小的杯子中液体体积小于平均值，那么这个最大值就是最小杯子的液体体积，反之则是平均值。

代码如下：

#include <stdio.h>
#define ll long long
#define min(a,b) a<b?a:b
int main() {
    ll n,s,sum=0,mint=9999999999;
    scanf("%lld %lld",&n,&s);
    for(int i=0;i<n;i++)
    {
        ll t;
        scanf("%lld",&t);
        mint=min(mint,t);
        sum+=t;
    }
    if(sum<s)
        printf("-1\n");
    else
        printf("%lld\n",min(mint,(sum-s)/n));
    return 0;
}