If it didn’t go to the smallest value, negatives wouldn’t make sense. Because “1” on the first bit (the X in X000 0000 0000 0000 0000 0000 0000 0000) represents a “-“, when it is 0111 1111 1111 1111 1111 1111 1111 1111 (2147483647) and it ticks over to 1000 0000 0000 0000 0000 0000 0000 (supposedly 2147483648), the computer believes it is negative, but because the other 31 bits are 0s, you may think it is -0. That is not the case. The other 31 bits are put through a NOT gate (turning 0s into 1s and vice versa) and taking away one more, it makes sense 2147483647+1=-2147483648.