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+#!/usr/bin/env python3
+
+# Challenge 171
+#
+# Task 2: First-class Function
+# Submitted by: Mohammad S Anwar
+#
+# Create sub compose($f, $g) which takes in two parameters $f and $g as
+# subroutine refs and returns subroutine ref i.e. compose($f, $g)->($x) =
+# $f->($g->($x))
+#
+# e.g.
+#
+# $f = (one or more parameters function)
+# $g = (one or more parameters function)
+#
+# $h = compose($f, $g)
+# $f->($g->($x,$y, ..)) == $h->($x, $y, ..) for any $x, $y, ...
+
+import sys
+
+def compose(f, g):
+    return lambda x: f(g(x))
+
+def times3(x):
+    return 3 * x
+
+def times5(x):
+    return 5 * x
+
+h = compose(times3, times5)
+print(h(int(int(sys.argv[1]))))