1BS.py

def binary_sum(S, start, stop):
    if start >= stop:
        return 0
    elif start == stop - 1:
        return S[start]
    else:
        mid = (start + stop) // 2
        return binary_sum(S, start, mid) + binary_sum(S, mid, stop)

# Input
n = int(input("Enter the number of elements: "))
S = [int(input(f"Enter element {i+1}: ")) for i in range(n)]

# Compute sum
r = binary_sum(S, 0, n)
print(S)

# Output
print("Sum of sequence elements =", r)