#include <iostream>
#include <unordered_map>
#include <unordered_set>
#include <set>
#include <vector>
#include <numeric>
#include <algorithm>
#include <queue>
#include <string>
#include <random>
#include <array>
#include <climits>
#include <map>
#include <cassert>
#include <stack>
#include <iomanip>
#include <cfloat>
#include <bitset>
#include <fstream>
#include <chrono>

int main() {
	constexpr int MAX_K = 1000;
	int n, k; std::cin >> n >> k;
	std::vector<int> number(n);
	for (auto& a : number) {
		std::cin >> a;
	}
	std::vector<std::bitset<MAX_K + 1>> forward(n);
	forward[0].set(0, true);
	for (auto i = 1; i < n; ++i) {
		forward[i] = (forward[i - 1] << number[i - 1]) | forward[i - 1];
	}
	if (forward.back().test(k) || forward.back().test(k - number.back())) {
		int result{ 0 };
		std::bitset<MAX_K + 1> backward; backward.set(k, true);
		for (int i = n - 1; i >= 0; --i) {
			const auto a = number[i];
			if ((backward & forward[i]).none()) {
				result += 1;
			}
			backward |= backward >> a;
		}
		std::cout << result << '\n';
	}
	else {
		std::cout << "-1\n";
	}
}