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+#!/usr/bin/env python3
+
+# Challenge 075
+#
+# TASK #1 > Coins Sum
+# Submitted by: Mohammad S Anwar
+# You are given a set of coins @C, assuming you have infinite amount of each
+# coin in the set.
+#
+# Write a script to find how many ways you make sum $S using the coins from
+# the set @C.
+#
+# Example:
+# Input:
+#     @C = (1, 2, 4)
+#     $S = 6
+#
+# Output: 6
+# There are 6 possible ways to make sum 6.
+# a) (1, 1, 1, 1, 1, 1)
+# b) (1, 1, 1, 1, 2)
+# c) (1, 1, 2, 2)
+# d) (1, 1, 4)
+# e) (2, 2, 2)
+# f) (2, 4)
+
+import sys
+
+def show_coins(want, coins):
+    def show_coins1(want, have, coins, seen):
+        sum_have = sum(have)
+        if sum_have > want:
+            pass            # busted sum
+        elif sum_have == want:
+            out = ", ".join([str(x) for x in sorted(have)])
+            if not out in seen:
+                seen[out] = 1
+                print(out)
+        else:
+            for coin in coins:
+                show_coins1(want, have+[coin], coins, seen)
+
+    show_coins1(want, [], coins, {})
+
+S = int(sys.argv[1])
+C = [int(x) for x in sys.argv[2:]]
+show_coins(S, C)