#include <iostream>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <map>
#include <queue>
#include <limits>

static const int MOD = 1000000007;
using ll = long long;
using u32 = unsigned;
using namespace std;

template<class T>
constexpr T INF = ::numeric_limits<T>::max() / 32 * 15 + 208;

int main() {
    int n;
    cin >> n;
    map<string, int> m;
    for (int i = 0; i < n; ++i) {
        string s;
        cin >> s;
        m[s]++;
    }
    for (auto &&j : m) {
        if(j.second > (n+1)/2) {
            puts("NO");
            return 0;
        }
    }
    puts("YES");
    return 0;
}