#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N,V; cin >> N >> V;
    long long answer = 0;
    vector<pair<long long,long long>> C(N);
    for(int i=0; i<N; i++){
        int c; cin >> c; answer += c;
        C.at(i) = {c,i+1};
    }
    V -= N;
    if(V <= 0){cout << answer << endl; return 0;}
    for(int i=1; i<N; i++) C.at(i).first += C.at(i-1).first;
    sort(C.begin(),C.end(),[&](auto &a,auto &b){return a.first*b.second < b.first*a.second;});

    auto [c0,v0] = C.at(0);
    answer += V/v0*c0; V %= v0;
    vector<long long> dp(V+1,1e18);
    dp.at(0) = 0;
    for(auto [c,v] : C) for(int i=0; i<=V-v; i++) dp.at(i+v) = min(dp.at(i+v),dp.at(i)+c);
    answer += dp.back();
    cout << answer << endl;
}