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+#!/usr/bin/env python3
+
+# Challenge 072
+#
+# TASK #1 > Trailing Zeroes
+# Submitted by: Mohammad S Anwar
+# You are given a positive integer $N (<= 10).
+#
+# Write a script to print number of trailing zeroes in $N!.
+#
+# Example 1
+# Input: $N = 10
+# Output: 2 as $N! = 3628800 has 2 trailing zeroes
+#
+# Example 2
+# Input: $N = 7
+# Output: 1 as $N! = 5040 has 1 trailing zero
+#
+# Example 3
+# Input: $N = 4
+# Output: 0 as $N! = 24 has 0 trailing zero
+
+import re
+import sys
+
+def fact(n):
+    if n < 2:
+        return 1
+    else:
+        return n*fact(n-1)
+
+def trailing_zeros(n):
+    s = str(n)
+    if m := re.search(r'0+$', s):
+        return len(m.group(0))
+    else:
+        return 0
+
+N = int(sys.argv[1])
+print(trailing_zeros(fact(N)))