let itemCount = Int(readLine()!)!

var dic = [String:Int]()

var mx = 0
for i in 0..<itemCount {
    let nm = readLine()!
    if(dic[nm] == nil) {
        dic[nm] = 1
    } else {
        dic[nm] = dic[nm]! + 1
    }
    mx = max(mx, dic[nm]!)
}

let tmp = itemCount / 2 + (itemCount % 2)
if(mx > tmp) {
    print("NO")    
} else {
    print("YES")
}