#include <iostream>
#include <algorithm>
#define int long long
using namespace std;

int n, v;
int c[100];

signed main() {
	int i, num;
	int sumC = 0;
		
	cin >> n >> v;
	for (i = 0; i < n; i++) cin >> c[i];
	for (i = 0; i < n; i++) sumC += c[i];
	v -= n;
	if (v <= 0) { cout << sumC << endl; return 0; }
	
	int ans = 1e+15;
	for (num = 1; num <= n; num++) {
		int syo = v / num;
		int mod = v % num;
		int cst = 0;
		
		for (i = 0; i < mod; i++) {
			cst += (syo + 1) * c[i];
		}
		for (i = mod; i < num; i++) {
			cst += syo * c[i];
		}
		ans = min(ans, cst);
	}
	ans += sumC;
	
	cout << ans << endl;
	return 0;
}