C++ :

#include<bits/stdc++.h>
using namespace std;
int n,a,b,w[1000006],ans;
int main()
{
	cin>>n;
	while(n--)
	{
		cin>>a>>b;
		w[a]++;
		w[b+1]--;
	}
	for(int i=1;i<=1000000;i++)
	{
		w[i]+=w[i-1];
		ans=max(ans,w[i]);
	}
	cout<<ans;
    return 0;
}