num=int(input("enter a no"))
i=0
c=0
while i <num:
    if i*(i+1)==num:
        c=1
    i+=1
if c==1:
    print("pronic no")
else:
    print("not pronic no")
08a4d10434d783de18d868813f557f98afda85bd
<mask token>

<mask token>
while i < num:
    if i * (i + 1) == num:
        c = 1
    i += 1
if c == 1:
    print('pronic no')
else:
    print('not pronic no')

num = int(input('enter a no'))
i = 0
c = 0
while i < num:
    if i * (i + 1) == num:
        c = 1
    i += 1
if c == 1:
    print('pronic no')
else:
    print('not pronic no')

num=int(input("enter a no"))
i=0
c=0
while i <num:
    if i*(i+1)==num:
        c=1
    i+=1
if c==1:
    print("pronic no")
else:
    print("not pronic no")