from itertools import combinations

lis = [25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46]

dic = {}

for i in range(10, len(lis)):
	n = 0;
	for comb in combinations(lis, i):
		s = sum(comb);
		if 280 <= s <= 520:
			if s not in dic:
				dic[s] = []
			dic[s].append(comb)

print(dic[300])