#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
using ll=long long;
void solve(){
    ll N,V; cin>>N>>V;
    vector<ll> C(N);
    for(auto&x:C)cin>>x;
    ll ANS=accumulate(begin(C),end(C),0LL);
    if(V<=N){
        cout<<ANS;
        return;
    }
    V-=N;
    vector<ll> pref(N);
    partial_sum(begin(C),end(C),begin(pref));
    const int U=10010;
    vector<ll> dp(U,1e10);
    dp[0]=0;
    for(int i=1;i<=N;++i){
        for(int j=i;j<U;++j){
            ll cst=dp[j-i]+pref[i-1];
            if(dp[j]>cst)dp[j]=cst;
        }
    }

    vector<double> min_rate(N);
    for(int i=0;i<N;++i)min_rate[i]=(pref[i]*1.)/(i+1);
    const int n=min_element(begin(min_rate),end(min_rate))-begin(min_rate)+1;
    ll k=0;
    if(V>U)k=(V-U+n-1)/n;
    ANS+=k*pref[n-1];
    ANS+=dp[V-k*n];
    cout<<ANS;
}
int main(){
    ios::sync_with_stdio(0);
    cin.tie(nullptr);
    int T=1; // cin>>T;
    while(T--)solve();
    cout<<endl;
    return 0;
}