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

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int N; cin >> N;
    map<string, int> mp;
    rep(i,N) { string s; cin >> s; mp[s]++; }
    int ok = 1;
    for(auto [s, x] : mp) ok &= x <= (N + 1) / 2;
    cout << (ok ? "YES" : "NO") << endl;
}