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