diff --git a/wk1/Assignment 1 - Kaloyan Stoykov and Dimitar Byalkov.docx b/wk1/Assignment 1 - Kaloyan Stoykov and Dimitar Byalkov.docx
new file mode 100644
index 0000000..1e1ce27
Binary files /dev/null and b/wk1/Assignment 1 - Kaloyan Stoykov and Dimitar Byalkov.docx differ
diff --git a/wk1/caesar1.png b/wk1/caesar1.png
new file mode 100644
index 0000000..a69ea7f
Binary files /dev/null and b/wk1/caesar1.png differ
diff --git a/wk1/elm.json b/wk1/elm.json
new file mode 100644
index 0000000..ce2a08d
--- /dev/null
+++ b/wk1/elm.json
@@ -0,0 +1,24 @@
+{
+    "type": "application",
+    "source-directories": [
+        "src"
+    ],
+    "elm-version": "0.19.1",
+    "dependencies": {
+        "direct": {
+            "elm/browser": "1.0.2",
+            "elm/core": "1.0.5",
+            "elm/html": "1.0.0"
+        },
+        "indirect": {
+            "elm/json": "1.1.3",
+            "elm/time": "1.0.0",
+            "elm/url": "1.0.0",
+            "elm/virtual-dom": "1.0.3"
+        }
+    },
+    "test-dependencies": {
+        "direct": {},
+        "indirect": {}
+    }
+}
diff --git a/wk1/pythagoras1.png b/wk1/pythagoras1.png
new file mode 100644
index 0000000..b93456d
Binary files /dev/null and b/wk1/pythagoras1.png differ
diff --git a/wk1/src/Caesar1.elm b/wk1/src/Caesar1.elm
new file mode 100644
index 0000000..d336388
--- /dev/null
+++ b/wk1/src/Caesar1.elm
@@ -0,0 +1,48 @@
+module Caesar1 exposing (..)
+{-
+    Caesar cipher function
+    Dimitar Byalkov and Kaloyan Stoykov
+-}
+
+encode: Int -> Char -> Char
+encode offset character =
+    -- 65 A 90 Z
+    if Char.toCode(character) > 64 && Char.toCode(character) < 91 then
+        Char.fromCode(65 + modBy 26 (Char.toCode(character) - 65 + offset - 26))
+    -- 97 a 122 z
+    else if Char.toCode(character) > 96 && Char.toCode(character) < 123 then
+        Char.fromCode(97 + modBy 26 (Char.toCode(character) - 97 + offset - 26))
+    else Char.fromCode(32)
+
+decode: Int -> Char -> Char
+decode offset character = 
+    encode (0 - offset) character
+
+-- Tests
+
+testEncodeUpperSmallOffsetA: Bool
+testEncodeUpperSmallOffsetA = (encode 5 'A' == 'F')
+
+testEncodeUpperBigOffsetF: Bool
+testEncodeUpperBigOffsetF = (encode 348 'F' == 'P')
+
+testEncodeLowerSmallOffsetQ: Bool
+testEncodeLowerSmallOffsetQ = (encode 9 'q' == 'z')
+
+testEncodeLowerBigOffsetG: Bool
+testEncodeLowerBigOffsetG = (encode 215 'g' == 'n')
+
+testDecodeUpperSmallOffsetA: Bool
+testDecodeUpperSmallOffsetA = (decode 5 'F' == 'A')
+
+testDecodeUpperBigOffsetF: Bool
+testDecodeUpperBigOffsetF = (decode 348 'P' == 'F')
+
+testDecodeLowerSmallOffsetQ: Bool
+testDecodeLowerSmallOffsetQ = (decode 9 'z' == 'q')
+
+testDecodeLowerBigOffsetG: Bool
+testDecodeLowerBigOffsetG = (decode 215 'n' == 'g')
+
+allTests: List Bool
+allTests = [testEncodeUpperSmallOffsetA, testEncodeUpperBigOffsetF, testEncodeLowerSmallOffsetQ, testEncodeLowerBigOffsetG, testDecodeUpperSmallOffsetA, testDecodeUpperBigOffsetF, testDecodeLowerSmallOffsetQ, testDecodeLowerBigOffsetG]
\ No newline at end of file
diff --git a/wk1/src/Pythagoras1.elm b/wk1/src/Pythagoras1.elm
new file mode 100644
index 0000000..b569161
--- /dev/null
+++ b/wk1/src/Pythagoras1.elm
@@ -0,0 +1,93 @@
+module Pythagoras1 exposing (..)
+{-
+    Pythagoraen triples
+    Dimitar Byalkov and Kaloyan Stoykov
+-}
+
+sqr: Int -> Int
+sqr n =
+    n * n
+
+isTriple: Int -> Int -> Int -> Bool
+isTriple a b c =
+    if a <= 0 || b <= 0 || c <= 0 then
+        False
+    else if (sqr a + sqr b) /= sqr c then
+        False
+    else True
+
+leg1 : Int -> Int -> Int
+leg1 x y =
+    sqr x - sqr y
+
+leg2 : Int -> Int -> Int 
+leg2 x y =
+    2 * y * x
+
+hyp : Int -> Int -> Int
+hyp x y =
+    sqr x + sqr y
+
+pythTriple : (Int, Int) -> (Int, Int, Int)
+pythTriple inputTuple =
+    if Tuple.first inputTuple < 0 || Tuple.second inputTuple < 0 then
+        (0, 0, 0)
+    else
+        (leg1 (Tuple.first inputTuple) (Tuple.second inputTuple), leg2 (Tuple.first inputTuple) (Tuple.second inputTuple), hyp (Tuple.first inputTuple) (Tuple.second inputTuple))
+
+isTripleTuple : (Int, Int, Int) -> Bool
+isTripleTuple (a, b, c) = 
+    isTriple a b c
+
+-- Tests
+
+testSqr: Bool
+testSqr = (sqr 2 == 4)
+
+testSqrNegaviteNumber: Bool
+testSqrNegaviteNumber = (sqr -1 == 1)
+
+testIsTripleZeros: Bool
+testIsTripleZeros =  (isTriple 0 0 0 == False)
+
+testIsTripleNotEqual: Bool
+testIsTripleNotEqual = (isTriple 6 5 4 == False)
+
+testIsTripleNotEqual2: Bool
+testIsTripleNotEqual2 = (isTriple 4 6 5 == False)
+
+testIsTripleEqual: Bool
+testIsTripleEqual =(isTriple 3 4 5 == True)
+
+testLeg1: Bool
+testLeg1 = (leg1 5 6 == -11)
+
+testLeg1B: Bool
+testLeg1B = (leg1 7 3 == 40)
+
+testLeg2: Bool
+testLeg2 = (leg2 3 9 == 54)
+
+testLeg2B: Bool
+testLeg2B = (leg2 2 7 == 28)
+
+testHyp: Bool
+testHyp = (hyp 5 6 == 61)
+
+testHypB: Bool
+testHypB = (hyp 7 3 == 58)
+
+testInvalidPythTriple: Bool
+testInvalidPythTriple = (pythTriple (-5, -9) == (0, 0, 0))
+
+testPythTriple: Bool
+testPythTriple = (pythTriple (4, 5) == (-9, 40, 41))
+
+testPythTripleB: Bool
+testPythTripleB = (pythTriple (7, 3) == (40, 42, 58))
+
+testisTripleTuple: Bool
+testisTripleTuple = (isTripleTuple (3, 4, 5) == True)
+
+allPythTests: List Bool
+allPythTests = [testSqr, testSqrNegaviteNumber, testIsTripleZeros, testIsTripleNotEqual, testIsTripleNotEqual2, testIsTripleEqual, testLeg1, testLeg1B, testLeg2, testLeg2B, testHyp, testHypB, testInvalidPythTriple, testPythTriple, testPythTripleB, testisTripleTuple]