A=list(map(lambda n:int(n),input().split(" ")))
I=list(set(A))
def s(a,b):
    return 1-a*b
def r(a,b,c,d,e,f):
    return s(s(s(a,b),c),s(s(d,e),f))
def q():
    for n in range(64):
        n = f"{n:0>6b}"
        if r(*[int(n[I.index(k)]) for k in A]):
            return "YES"
    return "NO"
print(q())