diff --git a/complexity.js b/complexity.js
new file mode 100644
index 0000000..f80e3fa
--- /dev/null
+++ b/complexity.js
@@ -0,0 +1,62 @@
+function complexFunction(input) {
+    let result = 0;
+    for (let i = 0; i < input.length; i++) {
+        if (input[i] % 2 === 0) {
+            result += input[i];
+        } else {
+            result -= input[i];
+        }
+        if (input[i] % 3 === 0) {
+            result *= 2;
+        } else if (input[i] % 5 === 0) {
+            result /= 2;
+        } else if (input[i] % 7 === 0) {
+            result += 10;
+        } else if (input[i] % 11 === 0) {
+            result -= 10;
+        } else if (input[i] % 13 === 0) {
+            result *= 3;
+        } else if (input[i] % 17 === 0) {
+            result /= 3;
+        } else if (input[i] % 19 === 0) {
+            result += 20;
+        } else if (input[i] % 23 === 0) {
+            result -= 20;
+        } else if (input[i] % 29 === 0) {
+            result *= 4;
+        } else if (input[i] % 31 === 0) {
+            result /= 4;
+        } else if (input[i] % 37 === 0) {
+            result += 30;
+        } else if (input[i] % 41 === 0) {
+            result -= 30;
+        } else if (input[i] % 43 === 0) {
+            result *= 5;
+        } else if (input[i] % 47 === 0) {
+            result /= 5;
+        } else if (input[i] % 53 === 0) {
+            result += 40;
+        } else if (input[i] % 59 === 0) {
+            result -= 40;
+        } else if (input[i] % 61 === 0) {
+            result *= 6;
+        } else if (input[i] % 67 === 0) {
+            result /= 6;
+        } else if (input[i] % 71 === 0) {
+            result += 50;
+        } else if (input[i] % 73 === 0) {
+            result -= 50;
+        } else if (input[i] % 79 === 0) {
+            result *= 7;
+        } else if (input[i] % 83 === 0) {
+            result /= 7;
+        } else if (input[i] % 89 === 0) {
+            result += 60;
+        } else if (input[i] % 97 === 0) {
+            result -= 60;
+        } else {
+            result += input[i] * 2;
+        }
+    }
+    return result;
+}