// Born_To_Laugh - Hughie Do
#include <bits/stdc++.h>
#define alle(AC) AC.begin(), AC.end()
#define fi first
#define se second
using namespace std;
typedef long long ll;
[[maybe_unused]] const ll MOD = 998244353, INF = 1e18 + 7;
#define int ll
const int maxn = 1e5 + 10;
int m, n;
ll dpl[maxn], dpr[maxn];
ll a[maxn], b[maxn], c[maxn], d[maxn];
class SegTree
{
private:
int n;
vector<ll> tree;
inline void upd(int id, int l, int r, int pos, ll val){
if(l == r){
tree[id] = min(tree[id], val);
return;
}
int mid = (l + r) >> 1;
if(pos <= mid) upd(id << 1, l, mid, pos, val);
else upd(id << 1|1, mid + 1, r, pos, val);
tree[id] = min(tree[id << 1], tree[id << 1|1]);
}
inline ll qr(int id, int l, int r, int lo, int hi){
if(l > hi || r < lo) return INF;
else if(l >= lo && r <= hi) return tree[id];
int mid = (l + r) >> 1;
return min(qr(id << 1, l, mid, lo, hi), qr(id << 1|1, mid + 1, r, lo, hi));
}
public:
inline void init(int len){
n = len + 1;
tree.assign(n << 2, INF);
}
inline void upd(int pos, int val){
upd(1, 1, n, pos, val);
}
inline ll qr(int lo, int hi){
return qr(1, 1, n, lo, hi);
}
};
// dpl[i] = mincost to let evrball fr 1 -> b[i] fall in c[i];
// dpr[i] = mincost to let evrball fr a[i] -> n fall in c[i];
SegTree stl, str;
vector<ll> temp;
void solve(){
cin >> m >> n;
temp.push_back(0);
temp.push_back(1);
temp.push_back(n);
for(int i=1; i<=m; ++i){
cin >> a[i] >> b[i] >> c[i] >> d[i];
temp.push_back(a[i]);
temp.push_back(b[i]);
temp.push_back(c[i]);
}
sort(alle(temp));
temp.erase(unique(alle(temp)), temp.end());
n = lower_bound(alle(temp), n) - temp.begin();
for(int i=1; i<=m; ++i){
a[i] = lower_bound(alle(temp), a[i]) - temp.begin();
b[i] = lower_bound(alle(temp), b[i]) - temp.begin();
c[i] = lower_bound(alle(temp), c[i]) - temp.begin();
}
stl.init(n);
str.init(n);
ll ans = INF;
for(int i=1; i<=n; ++i){
dpl[i] = stl.qr(a[i], b[i]) + d[i];
dpr[i] = str.qr(a[i], b[i]) + d[i];
ans = min(ans, stl.qr(a[i], b[i]) + str.qr(a[i], b[i]) + d[i]);
if(a[i] == 1){
dpl[i] = min(dpl[i], d[i]);
}
if(b[i] == n){
dpr[i] = min(dpr[i], d[i]);
}
stl.upd(c[i], dpl[i]);
str.upd(c[i], dpr[i]);
}
if(ans >= INF) cout << -1 << '\n';
else cout << ans << '\n';
}
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
solve();
}
