#!/usr/bin/awk -f function mod(n, m) { return ((n % m) + m) % m } BEGIN { dial = 50 } { n = substr($0, 2) } /^L/ { sign = -1 acc += int(n / 100) + (n%100 >= dial && dial != 0) } /^R/ { sign = +1 acc += int((dial + n) / 100) } { dial = mod(dial + n*sign, 100) } END { print acc }