#include <bits/stdc++.h> using namespace std; #include <atcoder/all> using namespace atcoder; using mint = atcoder::static_modint<998244353>; // // using mint = atcoder::static_modint<1000000007>; using ld = long double; using ll = long long; #define mp(a,b) make_pair(a,b) #define rep(i,s,n) for(int i=s; i<(int)n; i++) const vector<int> dx{1,0,-1,0},dy{0,1,0,-1}; int main(){ int n,h;cin >> n >> h; vector<int> table(h+10); rep(i,0,n){ int a,b;cin >> a >> b; table[a]++; table[b+1]--; } rep(i,1,h+10)table[i]+=table[i-1]; cout << *max_element(table.begin(),table.end()); }