local ffi = require("ffi")
local C = ffi.C
ffi.cdef[[
long long atoll(const char*);
]]

local function lltonumber(str)
  return C.atoll(str)
end

n = io.read("*n", "*l")
local a = 0LL
for i = 1, n do
  a = a + lltonumber(io.read())
end
a = tostring(a):gsub("LL", "")
print(a)