what are my mistakes ?
package de.codegym.task.task04.task0428;
/*
Positive Zahl
*/
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
//schreib hier deinen Code
BufferedReader veysel = new BufferedReader (new InputStreamReader(System.in));
String a = veysel.readLine();
int num1 = Integer.parseInt(a);
String b = veysel.readLine();
int num2 = Integer.parseInt(b);
String c = veysel.readLine();
int num3 = Integer.parseInt(c);
int hey = 0;
if (num1>0 && num2>0 && num3>0)hey+3;
else if (num1<0 && num2<0 && num3<0)hey;
else if (num1>0 && num2>0 && num3<0)hey+2;
else if (num1>0 && num2<0 && num3<0)hey+1;
}
}