def PrintThreeElements(lst, N):
for i in range(0, len(lst)):
for j in range(i + 1, len(lst)):
for k in range(j + 1, len(lst)):
if lst[i] + lst[j] + lst[k] == N:
print(lst[i], lst[j], lst[k])
return
lst = [3, 2, 6, 4, 10, 5, 9, 7, 8, 12]
N = 24
PrintThreeElements(lst, N)
'''
run:
3 9 12
'''