#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 : case 9 : case 11: cout<<"31"<<endl; break; case 2 : cout<<"29"<<endl; break; default: cout<<"Invalid."<<endl; break; } return 0; }