#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
typedef long long ll;

int N, V;
ll C[110];
ll sum[110];

ll func(int p){
	ll res = 0;
	int v = V;

	v -= N;
	res += sum[N];

	if(v <= 0){
		return res;
	}

	res += sum[p] * (v / p);
	v -= p * (v / p);

	res += sum[v];
	return res;
}

int main(){
	cin >> N >> V;

	for(int i=0;i<N;i++){
		cin >> C[i];
	}

	sum[0] = 0;
	for(int i=0;i<N;i++){
		sum[i+1] = sum[i] + C[i];
	}

	ll res = 1ll << 62;
	for(int i=0;i<N;i++){
		res = min(res, func(i + 1));
	}

	cout << res << endl;
}