Untitled

mas=[1,2,3,4,5]
s1=0
for i in range(len(mas)):
    s1+=mas[i]
print(s1)
j=len(mas)-1
s2=0
while j>=0:
    s2+=mas[j]
    j-=1
print(s2)
def sum1(lst):
    s3 = 0
    for i in lst:
        if (type(i) == type([])):
            s3 = s3 + sum1(i)
        else:
            s3 = s3 + i
    return s3
print(sum1(mas))