多重if结构

package com.imooc;

import java.util.Scanner;

public class TypeExchange {

    public static void main(String[] args) {
        System.out.println("请输入乘积：");
        Scanner sc=new Scanner(System.in);
        int score=sc.nextInt();
        if(score>=) {
            System.out.println("优");
        }else {
            System.out.println("不及格");
        }

    }

}