#include <iostream>
#include <string>
using namespace std;
int main(int argc, char* argv[])
{
	string s1="1000000007";
	string s2;
	cin>>s2;
	int x=s1.length()-s2.length();
	if (x<0){
		x=-x;
	}
	cout<<x<<endl;
	return 0;
}