#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."; } return 0; }