#include <iostream> using namespace std; int main() { int n,m; int 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 /= 10; } } cout<<m-n+1-sum; return 0; }