diff --git a/array.txt b/array.txt
new file mode 100644
index 0000000..22f8ce4
--- /dev/null
+++ b/array.txt
@@ -0,0 +1,6 @@
+[ 50, 9, 17, 0] 
+[ 342, 689 ]
+[ 43, 5, 12, 99 ]
+[ 8, 4, 100 ]
+[ 0, 1, 2, 3, 4, 5, 6, 7 ]
+[ 1 ]
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diff --git a/greatest.py b/greatest.py
new file mode 100644
index 0000000..12215ac
--- /dev/null
+++ b/greatest.py
@@ -0,0 +1,54 @@
+#
+# Israel O. Dilan-Pantojas
+# israelodilan@gmail.com
+#
+
+
+# To run program you may pass a file through cli standard input
+# with an array or a list of numbers separated by commas as input.
+# You may also input an Array directly from cli standard input.
+# And finally you might want to enter it manually when you run 
+# the program, remember to use ("") quotations marks when doing so. 
+
+# Ex.
+# python greatest.py arrays.txt
+# python greatest.py "[ 50, 9, 17, 0 ]"
+# python greatest.py
+
+import sys
+from itertools import permutations
+
+# Parse array from all input sources
+def parse(a):
+	array = a.replace(" ", "").strip().lstrip("[(\"").rstrip("])\"").strip("[]]()\"").split(",")
+	return array
+
+# Determine max number from possible permutations of array
+def greatest(x):
+	lst = []
+	x = parse(x)
+	perms = list(permutations(x, len(x)))
+	for i in perms:
+		w = ""
+		for h in i:
+			w += h
+		lst.append(w)
+	print max(lst)
+	
+# Try different input sources
+try:  
+	arg = sys.argv[1]
+
+	try: 
+		with open(arg, 'r') as f:
+			for line in f:
+				greatest(line)
+
+	except:
+		greatest(arg)
+
+except:
+	arr = raw_input("Please input an array of valid natural integers separated by a comma: ")
+	greatest(arr)
+
+	
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