import sys
from itertools import permutations
from collections import Counter

def main():
    D = list(map(int, sys.stdin.readline().split()))
    cnt = Counter(D)
    for count in cnt.values():
        if count >= 4:
            print("NO")
            return
    for perm in permutations(D):
        valid = True
        for i in range(5):
            a, b, c = perm[i], perm[i+1], perm[i+2]
            if a == b or b == c or a == c:
                valid = False
                break
            if not (b == max(a, b, c) or b == min(a, b, c)):
                valid = False
                break
            if a >= c:
                valid = False
                break
        if valid:
            print("YES")
            return
    print("NO")

if __name__ == "__main__":
    main()