#include<iostream> 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<<lnvalid; } return 0; }