# include<iostream> using namespace std; int main(){ int m,n,a,b,c,v=0; cin>>n>>m; for(int i=n;i<=m;i++){ a=i; while(a!=0){ b=a%10; c=a%100; if(b==4||c==62){ v++; break; } a/=10; } } cout<<m-n+1-v; return 0; return 0; }