#if !__INCLUDE_LEVEL__

#include __FILE__



int main() {
  int n, p;
  input(n, p);
  VVI dp(n + 1, VI(p + 1, INT_MAX));
  dp[0][0] = 0;
  rep(i, 0, n) {
    VI d(4, 1);
    rep(i, 0, 3) input(d[i]);
    rep(k, 0, 4) {
      rep(j, 0, p + 1) {
        if(j + k <= p && dp[i][j] != INT_MAX) {
          chmin(dp[i + 1][j + k], dp[i][j] + d[k]);
          //print(i + 1, j + k, dp[i + 1][j - k]); 
        }
      }
    }
  }
  cout << fixed << setprecision(5);
  print((double)dp[n][p] / (double)n);
  return 0;
}
/*
平均順位の出し方
　最後にNで割れば良い
ナップザック
　dp[i][j] : コストがjを超えないように選ぶ
　コストの和をpにしなければならない
*/

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

#define _GLIBCXX_DEBUG 
#define rep(i, j, n) for(int i = j; i < n; i++)
#define rrep(i, j, n) for(int i = n - 1; j <= i; i--)
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define MOD1 = 998244353;
#define MOD2 = 1000000007;

using LL = long long;
using VI = vector<int>;
using VS = vector<string>;
using VLL = vector<LL>;
using VC = vector<char>;
using VD = vector<double>;
using VB = vector<bool>;
using PII = pair<int, int>;
using PSS = pair<string, string>;
using PIS = pair<int , string>;
using PSI = pair<string, int>;
using PLL = pair<LL, LL>;
using PCC = pair<char, char>;
using VVI = vector<VI>;
using VVS = vector<VS>;
using VVLL = vector<VLL>;
using VVC = vector<VC>;
using VVD = vector<VD>;
using VPII = vector<PII>;
using VPSS = vector<PSS>;
using VPIS = vector<PIS>;
using VPSI = vector<PSI>;
using VPLL = vector<PLL>;

template<typename T> bool chmax(T& a, const T &b) { if (a < b) { a = b; return true; } return false; }
template<typename T> bool chmin(T& a, const T &b) { if (a > b) { a = b; return true; } return false; }
template<class... T> void input(T&... a) { (cin >> ... >> a); }
template<class T> void print (const T &a) { cout << a << '\n'; }
template<class T, class... Ts> void print(const T& a, const Ts&... b) { cout << a; (cout << ... << (cout << ' ', b)); cout << '\n'; }

LL power(LL n, LL k) { LL res = 1; while(k) if(k & 1) { res *= n; n *= n; k >>= 1; } return res; }
LL power_mod(LL n, LL k, LL mod) { LL res = 1; while(k) { if(k & 1) res = res * n % mod; n = n * n % mod; k >>= 1; } return res; }
bool is_prime(LL n) { if(n == 1) return 0; for(LL i = 2; i * i <= n; i++) if(n % i == 0) return 0; return 1; }
VLL enum_divisors(LL n) { VLL res; for(LL i = 1; i * i <= n; i++)  if(n % i == 0) { res.push_back(i); if(n / i != i) res.push_back(n / i); }  sort(all(res)); return res; }
VPLL prime_factorize(LL n) { VPLL res; for(LL i = 2; i * i <= n; i++) { if(n % i != 0) continue; LL ex = 0; while(n % i == 0) { ex++; n /= i; } res.push_back({i, ex}); } if(n != 1) res.push_back({n, 1}); return res; }


#endif