local a,v=io.read("n","n")
local b,w=io.read("n","n")
local t=io.read("n")

if a<b then
    if a+v*t>=b+w*t then
        print("YES")
    else
        print("NO")
    end
else
    if a-v*t>=b-w*t then
        print("YES")
    else
        print("NO")
    end
end