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