#include <bits/stdc++.h>

#define forn(i,n) for(int i=0; i < n; ++i)

using namespace std;

typedef vector<int> vi;

int main(){
  ios_base::sync_with_stdio(0); cin.tie(0);
  int n, s; cin >> n >> s;
  vi a(n); 
  forn(i, n) cin >> a[i];

  vi cnt(4);
  forn(i, n){
    int cur = a[(i - 1 + n)%n] + a[i] + a[(i+1) % n];
    cnt[cur]++;
  }
  
  int ans = 0, idx = 3;
  while(s){
    int cur = min(s, cnt[idx]);
    ans += cur * idx;
    s -= cur,  n -= cur;
    --idx;
  }
  ans += 3*n;
  cout << ans << endl;
}