using System;

class SubAdd
{
	enum Operator
	{
		ADD,
		SUB
	}

	static void Main(String[] args)
	{
		String line = Console.ReadLine();
		int x, y;
		Operator op;
		int sign;
		int i,j;
		
		if(line[0] == '-')
		{
			sign = -1;
			i = 1;
		}
		else if(line[0] == '+')
		{
			sign = 1;
			i = 1;
		}
		else
		{
			sign = 1;
			i = 0;
		}
		j = i + 1;
		while(line[j] != '-' && line[j] != '+')
		{
			j++;
		}
		x = int.Parse(line.Substring(i, j-i)) * sign;
		if(line[j] == '+')
		{
			op = Operator.SUB;
		}
		else
		{
			op = Operator.ADD;
		}
		i = j + 1;
		if(line[i] == '+')
		{
			sign = 1;
			i++;
		}
		else if(line[i] == '-')
		{
			sign = -1;
			i++;
		}
		else
		{
			sign = 1;
		}
		y = int.Parse(line.Substring(i)) * sign;
		if(op == Operator.ADD)
		{
			Console.WriteLine(x+y);
		}
		else
		{
			Console.WriteLine(x-y);
		}
	}
}