#include <iostream>
#include <string>
#include <map>

void solve() {
    int n;
    std::cin >> n;

    std::map<std::string, int> cnt;
    for (int i = 0; i < n; ++i) {
        std::string s;
        std::cin >> s;

        if (!cnt.count(s)) cnt[s] = 0;
        ++cnt[s];
    }

    int max = 0;
    for (auto p : cnt) max = std::max(max, p.second);

    std::cout << (n >= max * 2 + 1 ? "YES" : "NO") << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}