#include<bits/stdc++.h> using namespace std; int main(){ int a; cin>>a; switch(a) { 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; }