diff --git a/homeworks/07_Danail_Bozhkov/Howework1.py b/homeworks/07_Danail_Bozhkov/Howework1.py
new file mode 100644
index 0000000..254c6d0
--- /dev/null
+++ b/homeworks/07_Danail_Bozhkov/Howework1.py
@@ -0,0 +1,31 @@
+from math import sqrt
+
+def check_circles(centre1, radius1, centre2, radius2):
+
+    if(centre1 == centre2 and radius1 == radius2):
+        return "Matching"
+
+    x1, y1 = centre1
+    x2, y2 = centre2
+    distance = sqrt((x2 - x1)**2 + (y2 - y1)**2)
+    radius_sum = radius1 + radius2
+
+    if(distance == radius_sum):
+        return "Touching"
+
+    if(distance < radius1 or distance < radius2):
+        return "Containing"
+
+    if(distance < radius_sum):
+        return "Intercecting"
+
+    if(distance > radius1 + radius2):
+        return "No comman"
+
+
+c1 = (1,1)
+c2 = (-5, 6)
+c1_rad = 1
+c2_rad = 1
+
+check_circles(c1,c1_rad,c2,c2_rad)
diff --git a/homeworks/07_Danail_Bozhkov/hw_replace.py b/homeworks/07_Danail_Bozhkov/hw_replace.py
new file mode 100644
index 0000000..3ca8fe8
--- /dev/null
+++ b/homeworks/07_Danail_Bozhkov/hw_replace.py
@@ -0,0 +1,16 @@
+from typing import Any
+
+def replace(element: Any, find: str, replace: str):
+    if element == find:
+        return replace
+
+    for i in range(len(element)):
+        if element[i] == find:
+            element[i] = replace
+    
+    return element
+   
+
+list = [ 'a', 1, [ ['a', 'b'], 1], ([1, 3, 'a'], 'b')]
+res = replace(list, 'a', 'c')
+print(res)
diff --git a/homeworks/07_Danail_Bozhkov/num_ways.py b/homeworks/07_Danail_Bozhkov/num_ways.py
new file mode 100644
index 0000000..11fde88
--- /dev/null
+++ b/homeworks/07_Danail_Bozhkov/num_ways.py
@@ -0,0 +1,19 @@
+N = input("Enter how many stairs you will climb: ")
+
+def num_ways(n):
+    
+    if n < 0:
+        return 0
+        
+    if n == 0:
+        return 1
+
+    nums = [0] * (n+1)
+    nums[0] = 1
+    nums[1] = 2
+
+    for i in range(1, n+1):
+        nums[i] = nums[i-1] + nums[i-2]
+    return nums[n]
+
+print(num_ways(int(N)))