diff --git a/01/app.js b/01/app.js
index e69de29..5a9ad56 100644
--- a/01/app.js
+++ b/01/app.js
@@ -0,0 +1,9 @@
+users = ["Paweł Sikorski", "Adam Niedzielski", "Tomek Kurek", "Aleks Baran", "Magda Sobota"]
+
+const firstElementOfArray = users[0]
+console.log(firstElementOfArray)
+const thirdElementOfArray = users[2]
+console.log(thirdElementOfArray)
+const fifthElementOfArray = users[4]
+console.log(fifthElementOfArray)
+
diff --git a/02/app.js b/02/app.js
index 9ad302b..594faa6 100644
--- a/02/app.js
+++ b/02/app.js
@@ -20,4 +20,12 @@ function createRandomArray() {
 
 function getRandomInteger(min, max) {
     return Math.round(Math.random() * (max-min) + min);
-}
\ No newline at end of file
+}
+
+/* for(let i = 0; i < randomArray.length; i++) {
+    console.log(randomArray[i])
+} */
+function printElement(element) {
+    console.log(element)
+}
+randomArray.forEach(printElement)
\ No newline at end of file
diff --git a/03/app.js b/03/app.js
index cebcbc2..394aa47 100644
--- a/03/app.js
+++ b/03/app.js
@@ -1,2 +1,17 @@
 const n = 24;
-const oddNumbers = [];
\ No newline at end of file
+const oddNumbers = [];
+
+function findRandomOddNumberInGivenRange(range) {
+    let number = 0;
+    while((number % 2 === 0)) {
+        number = Math.round(Math.random() * range)
+    }
+    return number
+}
+
+for(let i = 0; i < n; i++) {
+    const number = findRandomOddNumberInGivenRange(n)
+    oddNumbers.push(number)
+    console.log(oddNumbers[i])
+}
+
diff --git a/04/app.js b/04/app.js
index 8285afd..e235f52 100644
--- a/04/app.js
+++ b/04/app.js
@@ -1 +1,12 @@
-const years = [1980, 1934, 2002, 2019];
\ No newline at end of file
+const years = [1980, 1934, 2002, 2019];
+
+function findDiffrence(year) {
+    return 2024 - year
+}
+
+const newMap = years.map(findDiffrence)
+
+for(let i = 0; i < newMap.length; i++) {
+    console.log(newMap[i])
+}
+
diff --git a/05/app.js b/05/app.js
index 1c6bb90..fd82a60 100644
--- a/05/app.js
+++ b/05/app.js
@@ -1 +1,5 @@
-const numbers = [1, 2, 3, 4, 5, 6, 7];
\ No newline at end of file
+const numbers = [1, 2, 3, 4, 5, 6, 7];
+const EvenNumbers = numbers.filter(el => el % 2 === 0);
+const sumOfNumbersFromArray = EvenNumbers.reduce((prev, curr) => prev + curr)
+
+console.log(sumOfNumbersFromArray)
\ No newline at end of file