#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr int MOD = 1000000007;
constexpr double PI = 3.14159265358979323846;

int main(){
    int n;
    cin >> n;
    map<string,int> mp;
    rep(i,n){
        string s;
        cin >> s;
        mp[s]++;
    }
    int k = (n+1)/2;
    bool ok = true;
    for(auto p:mp){
        if(p.second>k) ok = false;
    }

    if(ok) cout << "YES" << endl;
    else cout << "NO" << endl;
    return 0;
}