#include <iostream>
#include <math.h>
#include <algorithm>
#include <functional>
#include <vector>
#include <typeinfo>
#include <climits>
#include <ctype.h>
#include <string>
using namespace std;
#define INIT cin.tie(0); ios::sync_with_stdio(false);
#define FOR(i, a, n) for (int i = a; i < n; i++)
#define REP(i, n) for(int i = 0; i < n; i++)

int main()
{
    INIT;

    int n, m;
    cin >> n >> m;
    int C[n];
    REP(i, n) cin >> C[i];

    int cnt = 0;
    while(1){
        if(m == 0) break;
        else{
            int idx, mi = INT_MAX;
            REP(i, n){
                if(mi > C[i] and C[i] != 0){
                    mi = C[i];
                    idx = i;
                }
            }
            C[idx]--;
            m--;
            if(C[idx] == 0) cnt++;
        }
    }
    cout << cnt << endl;


    return 0;
}