instr = input()
instr_str = instr.split(" ")

short_t = int(instr_str[0])
long_t = int(instr_str[1])

total = int(short_t*3600 + long_t*60)

count = 0
result= 0

while count < 22:
	if total == int(43200*count/11):
		result = 0
	elif total > int(43200*count/11) and total < int(43200*(count+1)/11):
		result = (int(43200*(count+1)/11) -total)

	count = count+1

print(result)