#include using namespace std; #define int long long signed main(){ int n; cin>>n; for(int a=n/2;a1000000000||abs(b)>1000000000) continue; string s=to_string(abs(a)),t=to_string(abs(b)); if(count(s.begin(),s.end(),'7')||count(t.begin(),t.end(),'7')) continue; cout<