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#include <iostream>

using namespace std;

long long C(long long b){
	int counter = 0;
	do{
		if(b % 2 == 1) counter++;
	}while((b /= 2) > 0);
	return counter;
}

void moreStuff(long long * a, int n, long long m, long long * b, int index, long long & max){
	if(index >= n){
		long long tMax = 0;
		for(int i = 0; i < n; ++i){
			tMax += a[i] * C(b[i]);
		}
		if(tMax > max) max = tMax;
		
		return;
	}
	
	for(long long i = b[index - 1] + 1; i <= m; ++i){
		b[index] = i;
		moreStuff(a, n, m, b, index + 1, max);
	}
}

long long stuff(long long * a, int n, long long m){
	long long b [n];
	int index = 0;
	long long max = 0;
	for(long long i = 0; i <= m; ++i){
		b[index] = i;
		moreStuff(a, n, m, b, index + 1, max);
	}
	
	return max;
}

int main(){
	
	int n;
	long long m;
	cin >> n >> m;
	
	long long a[n];
	for(int i = 0; i < n; ++i){
		cin >> a[i];
	}
	
	cout << stuff(a, n, m) << endl;
	
	return 0;
}