#include <iostream>
using namespace std;
int main() {
// your code goes here
// int x,y;
// cin>>x>>y;
// if (y!=0){
// cout<<x/y;
// cout>>x+y;
// cout<<"sgdsg";
// }
// cout<<"Hello"<<endl;
// double x1;
// cin>>x1;
// if (x1==13){
// cout<<"умова виконана"<<endl;
// cout<<"11111"<<endl;
// }
// else{
// cout<<"умова не виконана"<<endl;
// cout<<"s222222"<<endl;
// }
// cout<<"Bye";
// bool b1,b2;
// b1=true;
// b2=true;
// cout<<b1<<" "<<b2<<endl;
// cout<<(b1 && b2)<<endl;/// and===&&
// cout<<(b1 or b2);
int x;
cin>>x;
if ((x>=1) and (x<=4) ){
cout<<"початкова";
}
else {
if ((x>=5) and (x<=9)){
cout<<"середня";
}
else{
if (x<=11){
cout<<"старша";
}
else{
cout<<"такого класу не існує"<<endl;
}
}
}
return 0;
}
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