#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstring>
#include <cmath>
#include <fstream>
#include <list>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <vector>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
struct edge { ll B, T, F, P; };

unsigned MOD = 1000000007;
ll _MOD = 1000000009;
double EPS = 1e-10;
int UNKO = INT_MAX;

int main() {
	int N, M; cin >> N >> M;
	priority_queue<int, vector<int>, greater<int> > pq;
	for (int i = 0; i < N; i++) {
		int C; cin >> C;
		pq.push(C);
	}
	while (M--) {
		int x = pq.top(); pq.pop();
		if (x - 1) pq.push(x - 1);
	}
	cout << N - pq.size() << endl;
}