#include<bits/stdc++.h> using namespace std; int n,m,a = 0; int main(){ cin>>n>>m; for (int i = n;i <= m;i++){ int g = i % 10; int s = i / 10 % 10; int b = i / 100 % 10; int q = i / 1000 % 10; int w = i / 10000 % 10; int sw = i / 100000 % 10; int bw = i / 1000000 % 10; if (g == 4 || s == 4 || b == 4 || q == 4 || w == 4 || sw == 4 || bw == 4){ continue; } else if (g == 2 && s == 6){ continue; } else if (s == 2 && b == 6){ continue; } else if (b == 2 && q == 6){ continue; } else if (q == 2 && w == 6){ continue; } else if (w == 2 && sw == 6){ continue; } else if (sw == 2 && bw == 6){ continue; } else{ a++; } } cout<<a; return 0; }