program b613
 
implicit none
integer :: a, b, v, w, t
integer(16) :: z, y
 
read *, a, v
read *, b, w
read *, t
 
z = abs(b - a)
y = abs(v - w)
 
if(v <= w) then
 print *, 'NO'
else if(z > t * y) then
 print *, 'NO'
else
 print *, 'YES'
end if
 
end program b613