The input consists of four lines, each line containing a single digit 0 or 1.
none
0
1
1
0
0
0
0
0
0
0
1
0
0
0
1
0
1
0
0
0
1
1
0
0
1
0
0
1
0
0
1
0
1
0
0
1
1
1
0
1
0
0
0
1
1
1
0
0
1
1
0
1
0
1
0
1
1
0
1
0
0
0
1
1
1
1
0
1
1
1
0
1
1
1
0
1
1
1
1
1
a = int(input())
b = int(input())
c = int(input())
d = int(input())

def nor(a,b):
    return not(a or b)

x = a ^ b
y = c or d
z = b and c
t = d ^ a

one = x and y
two = z or t

last = one ^ two

print(last)