diff --git a/1_sum.py b/1_sum.py
new file mode 100644
index 0000000..247448c
--- /dev/null
+++ b/1_sum.py
@@ -0,0 +1,12 @@
+def divisible(num,div):
+	if(num%div==0):
+		return 1
+	else:
+		return 0
+		
+sum=0;
+for i in range(1,500):
+	if divisible(i,5) and not divisible(i,7):
+		sum+=i
+
+print("sum of numbers less than 500 which are divisible by 5 and not divisible by 7 is: {}".format(sum))
diff --git a/2_area.py b/2_area.py
new file mode 100644
index 0000000..1483fda
--- /dev/null
+++ b/2_area.py
@@ -0,0 +1,3 @@
+l,b,h=6,8,10
+l,b,h=l*1.15,b*1.15,h*1.15
+print("required area is: {:.4f}".format(2*(l*b+b*h+h*l)))
diff --git a/3_list.py b/3_list.py
new file mode 100644
index 0000000..417ba10
--- /dev/null
+++ b/3_list.py
@@ -0,0 +1,9 @@
+list1=["Ron","Hermione","Harry","Professor","Dobby","List Items 2","The House Elf","Potter","Granger","Lockhart","Weasley"]
+list2=["Potter","Fred","Greg","George","Voldemort","Sirius","Dumbledore"]
+temp=""
+l=len(list1)
+for i in range(0,l-1):
+	for j in range(0,l-i-1):
+		if list1[j]>list1[j+1]:
+			list1[j],list1[j+1]=list1[j+1],list1[j]
+print(list1+list2)
diff --git a/4_pythagorean_triplet.py b/4_pythagorean_triplet.py
new file mode 100644
index 0000000..b5e528e
--- /dev/null
+++ b/4_pythagorean_triplet.py
@@ -0,0 +1,7 @@
+for a in range(1, 1000):
+    for b in range(a+1, 1000):
+        c = 1000-(a+b)
+        if (a**2)+(b**2)==(c**2):
+            if a+b+c==1000:
+                print(a*b*c)
+                break
diff --git a/5_lcm.py b/5_lcm.py
new file mode 100644
index 0000000..874aaeb
--- /dev/null
+++ b/5_lcm.py
@@ -0,0 +1,10 @@
+def gcd(a,b):
+	while b:
+		a,b=b,a%b
+	return a
+def lcm(a,b):
+	return (a*b)//gcd(a,b)
+x=1
+for i in range(2,21):
+	x=lcm(x,i)
+print(x)
diff --git a/6_prime.py b/6_prime.py
new file mode 100644
index 0000000..c8e88bf
--- /dev/null
+++ b/6_prime.py
@@ -0,0 +1,11 @@
+def prime(n):
+	for i in range(2,n//2+1):
+		if n%i==0:
+			return -1
+	return 1
+x=0
+print("prime numbers between 1 and 99999:")
+for i in range(1,99999):
+	x=prime(i)
+	if(x==1):
+		print(i)
diff --git a/7_palindrome.py b/7_palindrome.py
new file mode 100644
index 0000000..e495f47
--- /dev/null
+++ b/7_palindrome.py
@@ -0,0 +1,6 @@
+s1=input("Enter a string: ")
+s2=s1[::-1]
+if s1==s2:
+	print("{} is palindrome".format(s1))
+else:
+	print("{} is not a palindrome".format(s1))