def solution(a, b):
# 1
# sum=0
# for i in range(len(a)):
# sum += a[i] * b[i]
# return sum
# 2
# sum=0
# for i,j in zip(a,b):
# sum += i*j
# return sum
# 3
return sum([i*j for i, j in zip(a,b)])