#include<bits/stdc++.h>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

int main() {
    map<string, int> G;
    int N; cin >> N;
    rep(i, N) { string A; cin >> A; G[A]++; }
    bool ok = true;
    for (auto p : G) if (p.second > (N + 1) / 2) ok = false;
    cout << (ok ? "YES" : "NO") << endl;
    return 0;
}