#include <iostream> using namespace std; int main() { int n; cin >> n; switch(n) { 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; default: cout << "Invalid." << endl; } return 0; }