struct Scanner {
    private var stack = [String]()
    private var index = 0
    
    mutating func peek() -> String {
        if stack.count == index {
            stack += readLine()!.split(separator: " ").map{ String($0) }
        }
        return stack[index]
    }
    
    mutating func next() -> String {
        let value = peek()
        index += 1
        return value
    }
    
    mutating func nextInt() -> Int {
        return Int(next())!
    }
    
    mutating func nextDouble() -> Double {
        return Double(next())!
    }
}

var scanner = Scanner()

let A = (0 ..< 4).map { _ in scanner.nextInt() }

if A[0] < A[1], A[2] > A[3] {
    print("YES")
} else {
    print("NO")
}