#include <iostream> using namespace std; int main(){ int n; cin>>n; switch (n){ 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."; } }