diff --git a/algorithms/arithmetic/fib.c b/algorithms/arithmetic/fib.c
new file mode 100644
index 0000000..7c111ea
--- /dev/null
+++ b/algorithms/arithmetic/fib.c
@@ -0,0 +1,40 @@
+
+#include <Python.h>
+
+long long
+_fib(long long n) {
+    if (n < 2)
+        return n;
+    else
+        return _fib(n - 1) + _fib(n - 2);
+}
+
+static PyObject *
+fib(PyObject *self, PyObject *args) {
+    long long n;
+    if (!PyArg_ParseTuple(args, "L", &n))
+        return NULL;
+    return Py_BuildValue("L", _fib(n));
+
+}
+
+static PyMethodDef fib_methods[] = {
+        {
+                "fib_fast", fib,  METH_VARARGS, "Calcs fib."
+        },
+        {       NULL,       NULL, 0,            NULL}
+};
+
+static struct PyModuleDef fib_def =
+        {
+                PyModuleDef_HEAD_INIT,
+                "algorithms.arithmetic.fib", /* name of module */
+                "",          /* module documentation, may be NULL */
+                -1,          /* size of per-interpreter state of the module, or -1 if the module keeps state in global variables. */
+                fib_methods
+        };
+
+PyMODINIT_FUNC PyInit_fib(void) {
+    Py_Initialize();
+    return PyModule_Create(&fib_def);
+}
\ No newline at end of file
diff --git a/algorithms/arithmetic/fibonacci.py b/algorithms/arithmetic/fibonacci.py
new file mode 100644
index 0000000..b0f1d1f
--- /dev/null
+++ b/algorithms/arithmetic/fibonacci.py
@@ -0,0 +1,8 @@
+# Uses python3
+def fib_recursive(n):
+    if n <= 1:
+        return n
+
+    return fib_recursive(n - 1) + fib_recursive(n - 2)
+
+
diff --git a/requirements.txt b/requirements.txt
index e302695..207a964 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
 pytest==3.0.3
 pytest-cov==2.5.1
 python-coveralls==2.9.1
+Cython==0.27.3
diff --git a/setup.py b/setup.py
new file mode 100644
index 0000000..af4da12
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,29 @@
+import os
+
+from Cython.Build import cythonize
+from setuptools import setup, Extension
+
+
+def read(fname):
+    return open(os.path.join(os.path.dirname(__file__), fname)).read()
+
+
+ext_modules = [Extension("algorithms.arithmetic.fib", ["algorithms/arithmetic/fib.c"])]
+setup(
+    name="python_algorithms",
+    version="0.0.1",
+    author="Arseniy Antonov",
+    author_email="arseny.antonov@gmail.com",
+    description=("Python algorithms"),
+    license="MIT",
+    keywords="algorithms graph arithmetic cython",
+    packages=['algorithms', 'tests'],
+    long_description=read('README.rst'),
+    ext_modules=cythonize(ext_modules),
+    classifiers=[
+        "Development Status :: 3 - Alpha",
+        "Topic :: Utilities",
+        "License :: OSI Approved :: MIT License",
+    ],
+
+)