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