diff --git a/lesson_1/1_1.py b/lesson_1/1_1.py
new file mode 100644
index 0000000..70fe4e2
--- /dev/null
+++ b/lesson_1/1_1.py
@@ -0,0 +1,5 @@
+line = input()
+numbers = line.split()
+result = [float(num) for num in numbers]
+result = sum(result)
+print(result)
\ No newline at end of file
diff --git a/lesson_1/1_2.py b/lesson_1/1_2.py
new file mode 100644
index 0000000..a6d25c8
--- /dev/null
+++ b/lesson_1/1_2.py
@@ -0,0 +1,7 @@
+import re
+line = input()
+while True:
+    rule = input()
+    a,b = (remov for remov in rule.split('->'))
+    line = line.replace(a,b)
+    print(line)
\ No newline at end of file
diff --git a/lesson_1/1_3.py b/lesson_1/1_3.py
new file mode 100644
index 0000000..8d29e82
--- /dev/null
+++ b/lesson_1/1_3.py
@@ -0,0 +1,8 @@
+from math import fabs
+from math import floor
+line = input()
+numbers = line.split()
+result = [float(num) for num in numbers]
+absresult = [fabs(res) for res in result]
+fabsresult = [floor(absres) for absres in absresult]
+print(fabsresult)
\ No newline at end of file
diff --git a/lesson_1/1_4.py b/lesson_1/1_4.py
new file mode 100644
index 0000000..a43fb1f
--- /dev/null
+++ b/lesson_1/1_4.py
@@ -0,0 +1,6 @@
+line = input()
+numbers = line.split()
+result = [float(num) for num in numbers]
+powresult = [pow(res, 2) for res in result]
+sumresult = [sum(powresult)]
+print(sumresult)