郑州轻工业学院OJ：java1059

import java.util.Scanner;

public class Main {
public static void main(String[] args) {
int a;
int b=0;
Scanner in=new Scanner(System.in);
do {
a=in.nextInt();
b=Math.max(a, b);
}
while(a>=0);
System.out.println(b);
}

}