n = int(input())
a,b,c = map(int,input().split())

if a == c:
    print('No')
    exit()

if (n-c+a) <= n-1:
    if a < b:
        print('Yes')
    else:
        print('No')
else:
    if b < a:
        print('Yes')
    else:
        print('No')