Compute a + b treating both as 32-bit signed integers, using bitwise reasoning (carry via AND, sum via XOR). The result is guaranteed to fit in a signed 32-bit integer.
Input format
One line: two integers a and b.
Output format
One line: their sum.
Constraints
- -1000000000 <= a, b <= 1000000000
- The sum fits in a signed 32-bit integer.