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#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <list>
std::vector<std::string> split( const std::string & startline ,
const std::string & sep ) {
std::vector<std::string> separated ;
std::string::size_type start { 0 } ;
std::string::size_type pos ;
do {
pos = startline.find_first_of( sep , start ) ;
separated.push_back( startline.substr(start , pos - start )) ;
start = pos + 1 ;
} while ( pos != std::string::npos ) ;
return separated ;
}
int main( ) {
std::cout << "Please enter some integers, separated by a blank!\n" ;
std::string line ;
std::getline( std::cin , line ) ;
std::vector<std::string> numberstrings( split( line , " " ) ) ;
std::vector<int> numbers ;
for ( auto s : numberstrings )
numbers.push_back( std::stoi( s ) ) ;
std::sort( numbers.begin( ) , numbers.end( ) ) ;
std::list<int> theNumbers ;
for ( int i : numbers )
theNumbers.push_back( i ) ;
theNumbers.sort( ) ;
theNumbers.unique( ) ;
std::vector<int> allSums ;
for ( auto it = theNumbers.begin( ) ; it != theNumbers.end( ) ; it++ ) {
int sum = 0 ;
int ct = std::count( numbers.begin( ) , numbers.end( ) , *it - 1) ;
sum += ct * (*it - 1) ;
ct = std::count( numbers.begin( ) , numbers.end( ) , *it ) ;
sum += ct * *it ;
ct = std::count( numbers.begin( ) , numbers.end( ) , *it + 1 ) ;
sum += ct * (*it + 1 ) ;
allSums.push_back( sum ) ;
}
std::cout<< *max_element( allSums.begin( ) , allSums.end( ) ) << std::endl ;
return 0 ;
}
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