#include<bits/stdc++.h> using namespace std; int main(){ string s; int n; cin >> n >> s; for(int i=0;i<n-2;i++){ if(s[i]=='4'&&s[i+1]=='0'&&s[i+2]=='4'){cout << "Found"<< endl; return 0;} } cout << "NotFound" << endl; return 0; }