#!/usr/bin/env python3

YES = 'YES'
NO = 'NO'

def solve(a):
    return a[0] < a[1] and a[2] > a[3]

def main():
    a = list(map(int, input().split()))
    ans = solve(a)
    print(ans and YES or NO)

if __name__ == '__main__':
    main()