B = list(range(30,41+1))
C = list(range(50,56+1))
res = []

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