a, b, c = io.read("*n", "*n", "*n")
d = math.floor(a / b)
if(a % b ~= 0) then d = d + 1 end
e = math.floor(a / c)
if(a % c ~= 0) then e = e + 1 end
if(e * 3 <= d * 2) then io.write("YES") else io.write("NO") end