using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yukicoderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            string str = "1000000007";
            int ans = input.Length - str.Length;
            if(ans<0)
            {
                ans = ans * -1;
            }
            Console.WriteLine(ans);


        }
    }
}