diff --git a/1_sum_57.py b/1_sum_57.py
new file mode 100644
index 0000000..65ace09
--- /dev/null
+++ b/1_sum_57.py
@@ -0,0 +1,8 @@
+#!/usr/bin/python
+sum=0;
+for i in range(1,500):
+	if i%5==0 and i%7!=0:
+		sum=int(sum)+int(i)
+print("sum is : "+str(sum))	
+
+		
diff --git a/2_room_percent_inc.py b/2_room_percent_inc.py
new file mode 100644
index 0000000..b6f7eb5
--- /dev/null
+++ b/2_room_percent_inc.py
@@ -0,0 +1,12 @@
+#!/usr/bin/python
+ln=6
+wd=8
+ht=10
+area=int(ln)*int(wd)
+volume=int(ln)*int(ht)*int(wd)
+print("initial area is "+str(area))
+print("initial volume is "+str(volume))
+area1=float(int(ln)+float(15/100*ln))*float(int(wd)+float(15/100*wd))
+print("increased area is "+str(area1))
+volume2=float(int(ln)+float(15/100*ln))*float(int(wd)+float(15/100*wd))*float(int(ht)+float(15/100*ht))
+print("increased volume is "+str(volume2))
diff --git a/3_list_sort_concat.py b/3_list_sort_concat.py
new file mode 100644
index 0000000..9724305
--- /dev/null
+++ b/3_list_sort_concat.py
@@ -0,0 +1,12 @@
+list1=["Ron","Hermione","Harry","Professor","Dobby"]
+list2=["The House Elf","Potter","Granger","Lockhart","Weasley"]
+list1.sort()
+list2.sort()
+def concat(*s):  
+    x = []
+    for i in s:
+        x += i
+    return x
+list3=[]
+list3= concat(list1,list2)
+print(list3)
diff --git a/4_pythagorean_product.py b/4_pythagorean_product.py
new file mode 100644
index 0000000..476419d
--- /dev/null
+++ b/4_pythagorean_product.py
@@ -0,0 +1,15 @@
+for i in range(1,1000):
+	z=0
+	for j in range(1,i):
+		for k in range(1,i):
+			if(i**2==j**2+k**2 and i+j+k==1000):
+				z=1
+				print(i)
+				print(k)
+				print(j)
+				print("the product of required number is "+str(int(i*j*k)))
+				break
+		if z==1:
+			break
+	if z==1:
+		break
diff --git a/5_div_by20.py b/5_div_by20.py
new file mode 100644
index 0000000..a0b28a1
--- /dev/null
+++ b/5_div_by20.py
@@ -0,0 +1,20 @@
+n=1
+for i in range(1,20):
+	n=int(n)*i
+i=1
+while (i<n):
+	k=0
+	for j in range(1,20):
+		if i%j==0:
+			k=int(k)+1
+		
+	if k>=19:
+		print(i)
+		break
+	i=int(i)+1
+
+	
+	
+		
+		
+	
diff --git a/6_prime_99999.py b/6_prime_99999.py
new file mode 100644
index 0000000..f5511d1
--- /dev/null
+++ b/6_prime_99999.py
@@ -0,0 +1,13 @@
+import math
+def prime(num):
+	k=0
+	for i in range(2,num):
+		c=0
+		for j in range(2,int(math.sqrt(i)+1)):
+			if i%j==0:
+				c=1
+		if c==0:
+			print(i)
+prime(99999);
+		
+		
diff --git a/7_palindrome.py b/7_palindrome.py
new file mode 100644
index 0000000..724955b
--- /dev/null
+++ b/7_palindrome.py
@@ -0,0 +1,13 @@
+str=input("enter")
+l=len(str)
+k=l
+n=0
+for i in range(0,int(l/2)):
+	if str[i]==str[k-1]:
+		n=n+1
+	k=int(k)-1
+		
+if n==int(l/2):
+	print("given string "+str+" is palindrome")
+else:
+	print("given string "+str+" is not a palindrome")