using BenchmarkTools

a = 0
N0 = 10^8
@time for x in 1:N0
    global a
    a += x
end
print(a)

a = 0
N0 = 10^8
function f(a, N0)
    a = 0
    for x in 1:N0
        a += x
    end
    return a
end

@time b = f(a, N0)
print(b)