program main
    implicit none
	integer n, a, b, c
    read *, n
    a = n / 100
    b = (n - a*100) / 10
    c = mod(n, 10)
    if (a + c == b) then
        write (6, fmt="(A)") "Yes"
    else
        write (6, fmt="(A)") "No"
    end if
end program main