fn read<T: std::str::FromStr>() -> T {
  let mut s = String::new();
  std::io::stdin().read_line(&mut s).ok();
  s.trim().parse().ok().unwrap()
}

fn main() {
  use std::collections::HashMap;

  let n:usize = read();

  let mut etom = HashMap::new();
  for _i in 0..n {
    let eto:String = read();
    let count = etom.entry(eto).or_insert(0);
    *count += 1;
  }

  let limit = if n % 2 == 0 {
    n / 2
  } else {
    n - n / 2
  };

  let mut result = "YES";
  for (_key, count) in &etom {
    if *count > limit {
      result = "NO";
      break;
    }
  }
  println!("{}", result);
}