#include<bits/stdc++.h>
using namespace std;

int main(){
    int N,M,tmp;
    vector<int> c;

    cin >> N >> M;
    while(cin >> tmp) c.push_back(tmp);

    tmp=0;
    for(int i=0;i<M;i++){
        sort(c.begin(),c.end());
        c.front()--;
        if(c.front()==0){
            tmp++;
            c.erase(c.begin());
        }
    }

    cout << tmp << endl;

    return 0;
}