#include<bits/stdc++.h> using namespace std; int main (){ freopen("ticket.in", "r", stdin); freopen("ticket.out", "w", stdout); int n,m; cin >> n >> m; int a,b,c,d,e; int p = 0; for (int i = n;i <= m;i++){ a = i / 10000; b = i % 10000 / 1000; c = i % 1000 / 100; d = i % 100 / 10; e = i % 10; if (a != 4 && b != 4 && c != 4 && d != 4 && e != 4){ p++; } } cout << p; return 0; }