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#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)
using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); }
//---------------------------------------------------------------------------------------------------



typedef long long ll;
#define INF 1LL<<60
ll N, V; ll C[101];
//---------------------------------------------------------------------------------------------------
ll L[101];
void reduction() {
    L[0] = 1;
    rep(i, 1, N) {
        L[i] = L[i - 1] + 1;
        C[i] += C[i - 1];
    }
}
//---------------------------------------------------------------------------------------------------
ll dp[1010101];
void makedp(int up) {
    rep(i, 0, up) dp[i] = INF;
    dp[0] = 0;
    rep(i, 1, up) {
        rep(j, 0, N) {
            int ii = i - L[j];
            if (0 <= ii) dp[i] = min(dp[i], dp[ii] + C[j]);
        }
    }
}
//---------------------------------------------------------------------------------------------------
void _main() {
    cin >> N >> V;
    rep(i, 0, N) cin >> C[i];

    ll sm = 0;
    rep(i, 0, N) sm += C[i];

    if (V <= N) {
        cout << sm << endl;
        return;
    }

    ll ans = sm;
    V -= N;

    reduction();

    int mi = 0;
    rep(i, 1, N) {
        // C[i] / L[i] < C[mi] / L[mi]
        if (C[i] * L[mi] < C[mi] * L[i]) mi = i;
    }

    makedp(N * N);

    ll rest = V % (L[mi] * L[mi]);
    ans += 1LL * (V - rest) * C[mi] / L[mi];
    ans += dp[rest];
    cout << ans << endl;
}