diff --git a/README.md b/README.md
index 55a8bfe..7f2862e 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,4 @@
 # Fast functions for LOQC
 - Permanent (hardcoded up to 4x4 and Ryser)
 - Parallel permanent
+- No Cython dependency
diff --git a/lib/__init__.py b/lib/__init__.py
index 8b13789..ddb0c27 100644
--- a/lib/__init__.py
+++ b/lib/__init__.py
@@ -1 +1 @@
-
+from permanent import permanent
diff --git a/run-tests.py b/run-tests.py
index cce6d60..5062177 100644
--- a/run-tests.py
+++ b/run-tests.py
@@ -4,32 +4,8 @@ import multiprocessing as mp
 import numpy as np
 import lib
 
-
-def test_fn(perm_fn, name, dimension=6, steps=1000, dt=1e-3, bodies=101, threads=1):
-    # Test the speed of the evolution function. 
-    sreal=np.random.uniform(0,1,(dimension, dimension))
-    scomp=np.random.uniform(0,1,(dimension, dimension))
-    submatrix=sreal+1j*scomp
-
-    t0 = time.time()
-    for i in range(steps):
-        p=perm_fn(submatrix)
-    t1 = time.time()
-
-    print "{0} ({1}): {2} steps/sec".format(name, threads, int(steps / (t1 - t0)))
-    
-
-if __name__ == "__main__":
-    d=4
-    steps=1000
-
-    # Test on one core
-    test_fn(lib.perm_python, "1 core, C", steps=steps, threads=1)
-
-    # Test on one core
-    test_fn(lib.perm_c, "1 core, C", steps=steps, threads=1)
-    
-    # Test on four cores
-    test_fn(lib.perm_c, "All cores, C", steps=steps/threads, threads=threads)
-
-
+dimension=8
+real=np.random.uniform(0,1,(dimension, dimension))
+imag=np.random.uniform(0,1,(dimension, dimension))
+submatrix=real+1j*imag
+print "OUTPUT: ", lib.permanent(submatrix)
diff --git a/run-tests.sh b/run-tests.sh
index add786a..5b96cd0 100755
--- a/run-tests.sh
+++ b/run-tests.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
 
-rm lib/*.so
+#rm lib/*.so
 python ./setup.py build_ext --inplace &&
 python ./run-tests.py
diff --git a/setup.py b/setup.py
index 53caa55..2ec325c 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@ setup(name             = "loqcmath",
       url              = "https://www.peteshadbolt.co.uk",
       ext_modules      = [
           Extension(
-              'perm_c', ['src/perm_c'],
+              'permanent', ['src/permanent.c'],
               extra_compile_args=["-Ofast", "-march=native"]),
       ], 
       
diff --git a/src/permanent.c b/src/permanent.c
index 334411e..35db4dd 100644
--- a/src/permanent.c
+++ b/src/permanent.c
@@ -41,57 +41,14 @@ PyMODINIT_FUNC initpermanent(void) {
                                     (x1) * PyArray_STRIDES(py_F)[1])))
 #define F_shape(i) (py_F->dimensions[(i)])
 
-
-/*****************************************************************************
- * compute_F                                                                 *
- *****************************************************************************/
-static inline void compute_F(npy_int64 N,
-                             PyArrayObject *py_m,
-                             PyArrayObject *py_r,
-                             PyArrayObject *py_F) {
-  npy_int64 i, j;
-  npy_float64 sx, sy, Fx, Fy, s3, tmp;
-  
-  // Set all forces to zero. 
-  for(i = 0; i < N; ++i) {
-    F(i, 0) = F(i, 1) = 0;
-  }
-  
-  // Compute forces between pairs of bodies.
-  for(i = 0; i < N; ++i) {
-    for(j = i + 1; j < N; ++j) {
-      sx = r(j, 0) - r(i, 0);
-      sy = r(j, 1) - r(i, 1);
-
-      s3 = sqrt(sx*sx + sy*sy);
-      s3 *= s3 * s3;
-
-      tmp = m(i) * m(j) / s3;
-      Fx = tmp * sx;
-      Fy = tmp * sy;
-
-      F(i, 0) += Fx;
-      F(i, 1) += Fy;
-
-      F(j, 0) -= Fx;
-      F(j, 1) -= Fy;
-    }
-  }
-}
-
 static PyObject *permanent(PyObject *self, PyObject *args) {
   // Declare variables. 
   npy_int64 d, i, j;
-  npy_float64 output;
+  Py_complex sum;
   PyArrayObject *submatrix;
 
   // Parse variables. 
-  if (!PyArg_ParseTuple(args, "ldllO!O!O!O!",
-                        &threads,
-                        &dt,
-                        &steps,
-                        &N,
-                        &PyArray_Type, &submatrix)) {
+  if (!PyArg_ParseTuple(args, "O!", &PyArray_Type, &submatrix)) {
     return NULL;
   }
 
@@ -102,5 +59,6 @@ static PyObject *permanent(PyObject *self, PyObject *args) {
     }
   }
 
-  Py_RETURN_NONE;
+  PyObject *output=PyComplex_FromCComplex(sum);
+  return output;
 }