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