#include<iostream> #include<cstdio> 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"<<endl; break; case 4: case 6: case 9: case 11: cout<<"30" <<endl; break; case 2: cout<<"28"<<endl; break; } return 0; }