# Write a function: def solution(A, B) that, given two non-negative integers A and B - Interview Questions

Write a function: def solution(A, B) that, given two non-negative integers A and B, returns the number of bits set to 1 in the binary representation of the number A * B. For example, given A = 3 and B = 7 the function should return 3, because the binary representation of A* B = 3 * 7 = 21 is 10101 and it contains three bits set to

1. Assume that:  A and B are integers within the range [0...100,000,000] In your solution, focus on correctness

Solution

```def solution(A,B):
C =A*B
bin_c = bin(C).replace("0b","") #converting to binary
form res = [int(x) for x in str(bin_c)] #converting binary number to list of 0 and 1
c_1 = 0 #counter for 1
for i in range(len(res)): #counting the number of 1's in list
if res[i]== 1:
c_1 = c_1 + 1
return c_1
print(solution(3,7))
print(solution(5,25))
print(solution(5,13))
```

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