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+# Algorithms and Data Structures: Tutorial 4
+
+This package contains the following files:
+
+* `construct.h`, `construct.c`: Lisp construct (with `cons`, `car` and `cdr`)
+* `Ex1.c`: take 2 integers from stdin and print there product to stdout
+* `Ex2.c`: print all primes in 1..n to stdout with n from stdin
+* `Ex3.c`: print to stdout the sum of elements from stdin
+* `Ex4.c`: exchange given amount of money from stdin to least number
+  of [1 2 5 10 20 50] bills and print the pairs of (amount, bill) to stdout
+* `Bonus.c`: Towers of Hà Nội problem: no link list or stack needed
+
+Compilation can be done as follows
+
+    cc Ex1.c -o Ex1
+    cc Ex2.c -o Ex2
+    cc construct.c Ex3.c -o Ex3
+    cc Ex4.c -o Ex4
+    cc Bonus.c -o Bonus
+
+All source files are as licensed under the Unlicense which states
+
+> This is free and unencumbered software released into the public domain.
+>
+> Anyone is free to copy, modify, publish, use, compile, sell, or
+> distribute this software, either in source code form or as a compiled
+> binary, for any purpose, commercial or non-commercial, and by any
+> means.
+>
+> In jurisdictions that recognize copyright laws, the author or authors
+> of this software dedicate any and all copyright interest in the
+> software to the public domain. We make this dedication for the benefit
+> of the public at large and to the detriment of our heirs and
+> successors. We intend this dedication to be an overt act of
+> relinquishment in perpetuity of all present and future rights to this
+> software under copyright law.
+>
+> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+> EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+> MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+> IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+> OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+> ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+> OTHER DEALINGS IN THE SOFTWARE.
+>
+> For more information, please refer to <http://unlicense.org/>