#include <bits/stdc++.h>
#define ar array
//#define int long long
using namespace std;
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
const int mod = 1e9 + 7;
const ll inf = 1e18;
const int N = 1e5 + 5;
signed main() {
ios_base::sync_with_stdio(false);
cout.tie(0); cin.tie(0);
int n, m; cin >> n >> m;
vector<ar<int, 3> > a(n+1);
vector<int> ord;
for(int i=1; i<=n; i++) {
cin >> a[i][0] >> a[i][1] >> a[i][2];
ord.push_back(a[i][2]);
}
a.push_back({ m, 0, m });
ord.push_back(m);
sort(a.begin()+1, a.end());
sort(ord.begin(), ord.end());
ll ans = 1e9; n++;
for(int d : ord) {
ll sum = 0, mn = -1e9, ok = 1;
for(int i=1; i<=n; i++) {
if(a[i][2] >= d) {
mn = max(mn, a[i][0] - sum);
sum += a[i][1];
}
}
if(d >= mn) ans = min(ans, mn);
}
cout << ans << '\n';
}
