#include<stdio.h>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>
#include <sstream>
#include <iostream>
#include <string>
#include <stdio.h>

using namespace std;

int main() {

	int N, M;
	cin >> N >> M;
	vector<int> v(N);

	for (int i = 0; i < N; i++) {
		cin>>v[i];
	}

	sort(v.begin(), v.end());

	int cnt = 0, m = 0;
	bool flag = false;
	while (1) {
		v[m]--;
		if (v[m] == 0) m++, cnt++;
		M--;
		if (M == 0) break;
	}

	cout << cnt << endl;

	return 0;
}