#include <bits\stdc++.h> 
  
 using namespace std; 
  
 typedef long double ld; 
  
 #define int long long 
 #define all(a) a.begin(), a.end() 
 #define pb push_back 
  
  
 void fast_io() 
 { 
 	ios_base::sync_with_stdio(0); 
     cin.tie(0); cout.tie(0); 
 } 
  
 int StrToInt(string s) 
 { 
 	for(int i = 0; i < s.size(); i++) 
 		assert(s[ i] >= '0' && s[ i] <= '9'); 
 	stringstream f; 
 	f.clear(); 
 	f << s; 
 	int result = 0; 
 	f >> result; 
 	return result; 
 } 
  
 signed main() 
 { 
     fast_io(); 
     freopen("24.txt", "r", stdin); 
     char c; 
     int best = 0; 
     string buff = ""; 
     while(cin >> c) 
     { 
     	if (c >= '0' && c <= '9') 
     	{ 
     		buff += c; 
     		int number = StrToInt(buff); 
     		if (number % 2 == 0) 
     			best = max(best, number); 
     	} 
     	else 
     	{ 
     		buff = ""; 
     	} 
     } 
     cout << best; 
     return 0; 
 }