#!/usr/bin/luajit

json = require ("cjson")

fn = '/home/alex/src/bench/jsonParse/data/39m.json'

f = io.open (fn)
s = f:read ('*a')
f:close()

j = json.decode (s)

n = 0
for _ in pairs (j) do
    n = n + 1
end
print (n)