local ffi = require 'ffi'
local C, ct = ffi.C, ffi.typeof 'uint64_t[1]'
ffi.cdef [[
int printf(const char *, ...);
int scanf(const char *, ...);
]]

C.printf("%lu\n", (function (cd, n)
	local r=0ULL
	for _=1,n do C.scanf("%lu",cd) r=r+cd[0] end
	return r
end)(ct(), io.stdin:read("*n")))