#include <iostream> using namespace std; int main() { int score; cin >> score; if(score>=90 && score<=100){ cout<<"优秀"; return 0; } if(score>=80 && score<=89) { cout<<"良"; return 0; } if(score>=70 && score<=79) { cout<<"中"; return 0; } if(score>=60 && score<=69) { cout<<"及格"; return 0; } if(score>=0 && score<=59) { cout<<"差"; return 0; } else cout<<"成绩不合法" ; return 0; }