hello = []
for i in xrange(26):
    c = input()
    if i in [3, 4, 7, 11, 14, 17, 22]: # dehlorw
        hello.append(c)
#print hello

hello_n = hello[0] * hello[1] * hello[2] * hello[5] * hello[6]
hello_n *= (hello[4])/2 * -(-hello[4]/2)

k = -(-hello[3] *2/3)
hello_n *= k * (k-1) /2
hello_n *= hello[3]/3

print hello_n