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