import sequtils, strutils const ts = { "++":" p ", "+-":" m ", "-+":" m ", "--":" p ", "+" :" p ", "-" :" m ", } let xopy = stdin.readLine var seq1 = xopy.multiReplace(ts).split if seq1[0] == "": seq1 = seq1[1..^1] if seq1[0] == "m": seq1[1] = "-" & seq1[1] if seq1[0] in @["p", "m"]: seq1 = seq1[1..^1] let x = seq1[0].parseInt op = seq1[1] y = seq1[2].parseInt echo: if op == "p": x - y else: x + y