A,B = map(int,raw_input().split())
ans = 201
for a in xrange(101):
	for b in xrange(101):
		if a + b == 0: continue
		_A = int(round(a * 100. / (a + b)))
		_B = int(round(b * 100. / (a + b)))
		if A == _A and B == _B:
			ans = min(a+b,ans)
print ans