#include<iostream> 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";break; case 4: case 6: case 9: case 11: cout<<"30";break; case 2:cout<<"29";break; default:cout<<"Invalid."; } return 0; }