#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
#define REP(i,n) FOR(i,0,n)
#define SZ(n) (int)(n).size()
#define ALL(n) (n).begin(), (n).end()
#define MOD 1000000007
using namespace std;
typedef long long LL;
typedef vector<int> VI;

int main() {
	int n;
	cin >> n;
	map<string, int> a;
	REP(i, n) {
		string s;
		cin >> s;
		a[s]++;
	}
	int t;
	for (auto& i : a) {
		t = max(t, i.second);
	}
	if(t <= (n + 1) / 2)cout << "YES" << endl;
	else cout << "NO" << endl;
	return 0;
}