#include <bits/stdc++.h>
using namespace std;
int main (){
  int a=1,b=6,c=8,d=3,e=9,n;
  n=(700000+e/10+d/10+c/10+b/10+a/10-7)/4;
  cout<<n;


}

/**************************************************************
	Problem: 1013
	User: wtq001
	Language: C++
	Result: Wrong Answer
****************************************************************/