#include<iostream> using namespace std; int main(){ int month; cin>>month; int day; switch(month){ case 1:day=31;break; case 2:day=28;break; case 3:day=31;break; case 4:day=30;break; case 5:day=31;break; case 6:day=30;break; case 7:day=31;break; case 8:day=31;break; case 9:day=30;break; case 10:day=31;break; case 11:day=30;break; case 12:day=31;break; } cout<<day<<endl; return 0; }