program b613
 
implicit none
integer :: a, b, v, w, t, z
 
read *, a, v
read *, b, w
read *, t
 
z = abs(b - a) - t * (v - w)
 
if(z > 0) then
print *, 'NO'
else
print *, 'YES'
end if
 
end program b613