var x1,y1,x2,y2: real;
begin
readln(x1,y1,x2,y2);
if y1*y2<0 then write('да') else write('нет');
end.
x1y1 = [int(i) for i in input().split()]
x2y2 = [int(i) for i in input().split()]
if x1y1[1] > 0 and x2y2[1] > 0:
print('Нет')
elif x1y1[1] < 0 and x2y2[1] < 0:
print('Нет')
else:
print('Да')
