#include<iostream>
#include<fstream>
#include<vector>
using namespace std;

ifstream in("elmaj.in");
ofstream out("elmaj.out");

struct el {
	int nr,val;
};

int n,smax;
vector<el> h[666013];

inline int ha(int nr) {
	return nr%666013;
}

inline void add(int poz,int val) {
	el tm;
	int po = ha(poz);
	vector<el>::iterator it;
	
	tm.nr = poz; tm.val = val;
	
	for(it=h[po].begin();it!=h[po].end();++it)
		if(it->nr == poz) {
			
			it->val+=val;
			
			if(it->val > smax)
				smax = it->val;
			
			return;
		}
	
	h[ha(poz)].push_back(tm);
}

int main() {
	int i,x;
	
	in >> n;
	
	for(i=1;i<=n;++i) {
		in >> x;
		add(x,1);
	}
	
	out << smax << "\n";
	
	return 0;
}