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