#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    int n, m;
    int cnt = 0;
    std::vector<int> c;
    std::cin >> n >> m;
    c.resize(n);
    for (int i = 0; i < n; i++) {
        std::cin >> c[i];
    }
    std::sort(c.begin(), c.end());
    for (; m > 0; m--) {
        c[cnt]--;
        if (c[cnt] == 0) {
            cnt++;
        }
    }
    std::cout << cnt << std::endl;
}