# include<iostream> using namespace std; int main(){ int a; cin>>a; switch(a){ case 1: cout<<"31"<<endl; break; case 2: cout<<"29"<<endl; break; case 3: cout<<"31"<<endl; break; case 4: cout<<"30"<<endl; break; case 5: cout<<"31"<<endl; break; case 6: cout<<"30"<<endl; break; case 7: cout<<"31"<<endl; break; case 8: cout<<"31"<<endl; break; case 9: cout<<"30"<<endl; break; case 10: cout<<"31"<<endl; break; case 11: cout<<"30"<<endl; break; case 12: cout<<"31"<<endl; break; default: cout<<"Invalid."<<endl; } return 0; }