📅  最后修改于: 2022-03-11 14:46:22.894000             🧑  作者: Mango
#sum of natural number till n.
n=int(input('no. :'))
gross=0
no=0
while no < n:
no+=1
gross+=no
print('no.', no ,'sum of n', gross)
print('no.',n,'total',gross)