高中 a003: 兩光法師占卜術

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#include<iostream>
using namespace std;  
int main() {
     int M , D , S ;
     while(cin >> M >> D )
     {
          S=(M*2+D)%3 ;
          switch(S){
              case 0 :
                  cout << "普通" << endl;
                  break ;
              case 1 :
                  cout << "吉" << endl;
                  break ;
              case 2 :
                  cout << "大吉" << endl;
                  break ;
          }
     }
     return 0;
}