oisincar · February 13, 2019 02:20
diff --git a/Hydra.cpp b/Hydra.cpp
 #include <bits/stdc++.h>
 using namespace std;

 int main(){
    int o,O;
    while(cin>>o>>O,O++||o)
        cout<<(2>O&&o%2?-1:(o+O/2+O+3-O%2*3)/2+(o+O/2)%2*3)<<"\n";
 }
	#include <bits/stdc++.h>
	using namespace std;

	int main(){
	int o,O;
	while(cin>>o>>O,O++\|\|o)
	cout<<(2>O&&o%2?-1:(o+O/2+O+3-O%23)/2+(o+O/2)%23)<<"\n";
	}