1657+718-5+40635

The calculation can be done step by step:

1. \( 1657 + 718 = 2375 \)
2. \( 2375 - 5 = 2370 \)
3. \( 2370 + 40635 = 42905 \)

So, \( 1657 + 718 - 5 + 40635 = 42905 \).