local ffi = require 'ffi'
local C = ffi.C
ffi.cdef 'int scanf(const char *, ...);'

print((function (cd, n)
	local r = 0
	for _=1,n do C.scanf("%d",cd) r = cd[0]%2==0 and r+1 or r-1 end
	return math.abs(r)
end)(ffi.new("int32_t[1]"), io.stdin:read("*n")))