using System; using System.Collections.Generic; using System.Text; using System.Linq; class Program { public void Proc() { Reader.IsDebug = false; string inpt = Reader.ReadLine(); int x = 0; int y = 0; char op = ' '; for(int i=0; i 0 && IsNum(inpt[i-1]) && (!IsNum(inpt[i]))) { string xStr = inpt.Substring(0, i).Trim('+'); string yStr = inpt.Substring(i+1).Trim('+'); x = int.Parse(xStr); y = int.Parse(yStr); op = inpt[i]; break; } } int ans = x; if(op == '+') { ans -= y; } else { ans += y; } Console.WriteLine(ans); } private bool IsNum(char inpt) { return inpt >= '0' && inpt <= '9'; } public class Reader { public static bool IsDebug = true; private static String PlainInput = @" -2+-3 "; private static System.IO.StringReader Sr = null; public static string ReadLine() { if (IsDebug) { if (Sr == null) { Sr = new System.IO.StringReader(PlainInput.Trim()); } return Sr.ReadLine(); } else { return Console.ReadLine(); } } public static int[] GetInt(char delimiter = ' ', bool trim = false) { string inptStr = ReadLine(); if (trim) { inptStr = inptStr.Trim(); } string[] inpt = inptStr.Split(delimiter); int[] ret = new int[inpt.Length]; for (int i = 0; i < inpt.Length; i++) { ret[i] = int.Parse(inpt[i]); } return ret; } } static void Main() { Program prg = new Program(); prg.Proc(); } }