B = list(range(14,20+1))
C = list(range(15,27+1))
res = []

for l in range(200):
    for r in range(l, 200):
        A = list(range(l,r+1))
        ok = True
        for x in range(1,200):
            f = (x not in A) <= ((x in B) == (x in C))
            if not f:
                ok = False
                break
        if ok and (len(res) == 0 or len(A) < len(res)):
            res = A
print(res[-1] - res[0])