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#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <fstream>
#include <sstream>
#include <set>
#include <map>
#include <vector>
#include <list>
#include <algorithm>
#include <cstring>
#include <cmath>
#include <string>
#include <queue>
#include <bitset>		//UWAGA - w czasie kompilacji musi byc znany rozmiar wektora - nie mozna go zmienic
#include <cassert>
#include <iomanip>		//do setprecision
#include <ctime>
#include <complex>
#include <chrono>
#include<unordered_map>
using namespace std;

#define FOR(i,b,e) for(int i=(b);i<(e);++i)
#define FORQ(i,b,e) for(int i=(b);i<=(e);++i)
#define FORD(i,b,e) for(int i=(b)-1;i>=(e);--i)
#define REP(x, n) for(int x = 0; x < (n); ++x)
#define ALL(u) (u).begin(),(u).end()

#define ST first
#define ND second
#define PB push_back
#define MP make_pair
#define LL long long
#define ULL unsigned LL
#define LD long double

typedef pair<int, int> PII;

const double pi = 3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342;

const int MR = 210;
const int BIT = 60;
const LL inf = (LL)1e18 + 10LL;

inline int bitCnt(LL x)
{
	return __builtin_popcountll(x);
	/*int res = 0;
	while (x)
	{
		x &= x - 1;
		res++;
	}

	return res;*/
}

// find the minimum number with every amount of bits

LL tab[BIT], check[BIT];
inline void go(LL l, LL r)
{
	LL tmp = l;
	while (tmp <= r)
	{
		int ile = bitCnt(tmp);
		if (tab[ile] != -1)
			tmp |= tmp + 1;
		else
		{
			tab[ile] = tmp;
			tmp++;
		}
	}
}

LL a[MR];

int main()
{
	int n;
	LL m;
	scanf("%d%lld", &n, &m);
	REP(i, n)
		scanf("%lld", &a[i]);

	vector<pair<LL, LL>> V[2];
	V[1].push_back(MP(0, -1));
	bool sel = 1;

	REP(i, n)
	{
		sel = !sel;
		V[sel].clear();
		
		if (!a[i])
		{
			// dla 0 wez tylko jedna wartosc
			for (const auto &p : V[!sel])
				V[sel].push_back(MP(p.first, p.second + 1));
			continue;
		}

		// maksymalne m do wykorzystania na tej pozycji (zeby starczylo na reszte)
		LL mx = m - (n - i) + 1;
		LL prv = mx;

		vector<pair<LL, LL>> tmp;
		// jedz po poprzednich parach
		FORD(v, V[!sel].size(), 0)
		{
			auto p = V[!sel][v];
			

			// wyznacz minimalne liczby dla kazdej mozliwej wartosci - powiekszaj przedzial
			memset(tab, -1, sizeof(tab));
			go(p.second + 1, prv);
			prv = p.second;
			memset(check, -1, sizeof(check));

			{
				if (a[i] > 0)
				{
					// bierz kolejne wartosci dla coraz wiekszych bitow
					LL mx = inf;
					FORD(j, BIT, 0)
						if (tab[j] != -1 && tab[j] < mx)
						{
							check[j] = tab[j];
							mx = tab[j];
						}
				}
				else
				{
					// bierz kolejne wartosci dla coraz mniejszych bitow
					LL mx = inf;
					REP(j, BIT)
						if (tab[j] != -1 && tab[j] < mx)
						{
							check[j] = tab[j];
							mx = tab[j];
						}
				}
			}

			REP(j, BIT) if (check[j] != -1)
			{
				// wyznacz nowa wartosc
				LL v = p.first + j * a[i];
				tmp.push_back(MP(v, check[j]));
			}
		}

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

		for (int j = 0; j < tmp.size();)
		{
			int k = j + 1;
			while (k < tmp.size() && tmp[j].first == tmp[k].first)
				k++;

			while (!V[sel].empty() && V[sel].back().second >= tmp[j].second)
				V[sel].pop_back();
			V[sel].push_back(tmp[j]);

			j = k;
		}
	}

	printf("%lld\n", V[sel].back().first);

	return 0;
}

// FOR GNU C++ use the following pattern:
// Uncomment the code below and change your main into main2
// It does not build in MS C++
// But it does increase the stack size from 256 MB on CF and uses GNU C++

//#include <Processthreadsapi.h>
//#include <iostream>
//#include <Synchapi.h>
//#include <windows.h>
//#include <process.h>
//
//DWORD WINAPI MyThreadFunction(LPVOID lpParam) {
//    main2(nullptr);
//    return 0;
//}
//int main() {
//    auto h = CreateThread(nullptr, 1024 << 20, MyThreadFunction, nullptr, STACK_SIZE_PARAM_IS_A_RESERVATION, nullptr);
//    WaitForSingleObject(h, INFINITE);
//}