#include <iostream>
using namespace std;
int main()
{
int month;
cin>>month;
if (month==1 || month==3 || month==5 || month==7 || month==8 || month==10 || month==12) cout<<"31 день";
if (month==4 || month==6 || month==9 || month==11) cout<<"30 день";
if ( month==2) cout<<"28 день";
return 0;}
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