#include<bits/stdc++.h> using namespace std; int main(){ int a; cin>>a; switch(a){ case 1:cout<<"31"<<endl; break ; case 2:cout<<"29"<<endl; break ; case 3:cout<<"31"<<endl; break ; case 4:cout<<"30"<<endl; break ; case 5:cout<<"31"<<endl; break ; case 6:cout<<"30"<<endl; break ; case 7:cout<<"31"<<endl; break ; case 8:cout<<"31"<<endl; break ; case 9:cout<<"30"<<endl; break ; case 10:cout<<"31"<<endl; break ; case 11:cout<<"30"<<endl; break ; case 12:cout<<"31"<<endl; break ; default:cout<<"Invalid.";break; } return 0; }