Why doesn't it work?
package fr.codegym.task.task04.task0428;
/*
Nombre positif
*/
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
InputStream inputStream = System.in;
Reader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String a1 = bufferedReader.readLine();
int a = Integer.parseInt(a1);
String b1 = bufferedReader.readLine();
int b = Integer.parseInt(b1);
String c1 = bufferedReader.readLine();
int c = Integer.parseInt(c1);
if (a<0&&b<0&&c<0){
System.out.println(0);
}
else if ((a>0&&b<=0&&c<=0)||(a<=0&&b>0&&c<=0)||(a<=0&&b<=0&&c>0)){
System.out.println(1);
}
else if ((a>0&&b>0&&c<=0)||(a<=0&&b>0&&c>0)||(a>0&&b<=0&&c>0)){
System.out.println(2);
}
else if (a>0&&b>0&&c>0){
System.out.println(3);
}
}
}