#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(2): cout<<29<<endl; break; case(4): case(6): case(9): case(11): cout<<30<<endl; break; default: cout<<"Invalid."<<endl; break; } return 0; }