import sys
input = sys.stdin.readline
ans = 0
a, b = map(int, input().split())
if a == 0 or b== 0:
print(0)
sys.exit()
s = 0
e = 100000000000000000
while s <= e:
mid = (s + e) // 2
a_t = (24 / a) * mid
b_t = (24 / b) * mid
if a_t + b_t > 24:
e = mid - 1
else:
s = mid + 1
ans = max(ans, mid)
print(ans)