Test Cases problem even though its giving correct answer for negative values

#1

import java.util.*;
public class Main {
public static void main(String args[]) {
// Your Code Here
Scanner scn = new Scanner(System.in);
int min = scn.nextInt();
int max = scn.nextInt();

    if (min > max) {
        System.out.println("Min should be less than or equal to max.");
        return;
    }
    
    for (int i = min; i <= max; i += 20) {
        int celsius = (i - 32) * 5 / 9;
        System.out.println(i + "\t" + celsius);
    }
}

}

Testcase error: Dang! You couldn’t score a perfect 100 because you failed one or more testcases. This means that your program didn’t account for all input cases (did you account for negative numbers, for example?).