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