郑州轻工业大学OJ：java1033

import java.util.Scanner;

public class Main {
public static void main(String[] args) {
int a;
Scanner in=new Scanner(System.in) ;
a=in.nextInt();
if(a>=60) {
if(a>=70) {
if(a>=80) {
if(a>=90) {
System.out.println(“A”);
}else {
System.out.println(“B”);
}
}else {
System.out.println(“C”);
}
}else {
System.out.println(“D”);
}
}else {
System.out.println(“E”);
}
}

}