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