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