Problem: i wrote this on my phone at the airport

Code: i+wrote+this+on+my+phone+at+the+airport/tails_1692193487

Nibbles version: 0.2 | 0.21 | 0.22 | 0.23 | 0.24 | 0.25 | 1.00

Format: Compact | Simple | +Type | Table | JSON | .nbl (DeBruijn) | .nbl (names)

+ (add) 
    `$ (signum) 
        - (subtract) 
            ~ (auto = 1) 
            / (divide) 
                30 (integer) 
                `r (read int) 
                    @ (= fstLine) 
    * (multiply) 
        % (modulus) 
            / (foldr1) 
                @ (= fstLine) 
                $ (= B) <--arg( B A ) 
            4 (integer) 
        ~ (auto = 2)