from itertools import product
count = 0
for ops in product([1,2,3], repeat=6):
x = 1
for op in ops:
if op in [1,2]:
x += op
else:
x *= 2
if x == 20:
count += 1
#print(ops)
print(count)
ZnJvbSBpdGVydG9vbHMgaW1wb3J0IHByb2R1Y3QKY291bnQgPSAwCmZvciBvcHMgaW4gcHJvZHVjdChbMSwyLDNdLCByZXBlYXQ9Nik6CiAgICB4ID0gMQogICAgZm9yIG9wIGluIG9wczoKICAgICAgICBpZiBvcCBpbiBbMSwyXToKICAgICAgICAgICAgeCArPSBvcAogICAgICAgIGVsc2U6CiAgICAgICAgICAgIHggKj0gMgogICAgaWYgeCA9PSAyMDoKICAgICAgICBjb3VudCArPSAxCiAgICAgICAgI3ByaW50KG9wcykKcHJpbnQoY291bnQpCg==