#include<iostream> using namespace std; int main() { int a; cin>>a; if(a>=90){ cout<<"优秀"; } if(80<=a&&a<=89){ cout<<"良好"; } if(70<=a&&a<=79){ cout<<"中等"; } if(60<=a&&a<=69){ cout<<"及格"; } if(a<60){ cout<<"不及格"; } return 0; }