using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(ParseInt("67") - 1);

    }

    private static int ParseInt(string num)

    {

        int result = 0;

        int mult = 1;

        int low = 0;

        if (num[0] == '-')

            low = 1;

        for (int i = num.Length - 1; i >= low; i--)

        {

            result += mult * (num[i] - '0');

            mult *= 10;

        }

        if (low == 1)

            result *= -1;

        return result;

    }

}