16.branch-and-bound algorithm_count.py

'''
https://github.com/jmthibault79/rosalind/blob/b6d930af20f8ace840f6a462904d2a9ce5822807/textbook/Stepic-22-2.py
'''


def subpep(n):
	return n * (n+1) / 2 + 1

print(subpep(19461))