{}
def is_prime(n):
s = 0
for d in range(1, n + 1):
if n % d == 0:
if s>2:
break
s += 1
if s == 2:
return True
else:
return False
while True:
u=int(input("enter a number :"))
for i in range(2,u+1):
if is_prime(i):
print(i)
ch=int(input("do you want to continue?\n 1 for yes\n 2 for no:"))
if ch==2:
break