Can not find symbol num1 and num2

package com.codegym.task.task04.task0418;

/*
Minimum of two numbers

*/

import java.io.*;

public class Solution {
    public static void main(String[] args) throws Exception {
        //write your code here
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String n1 = reader.readLine();
        int num1 = Integer.parseInt(n1);
        String n2 = reader.readLine();
        int num2 = Integer.parseInt(n2);
        Solution sl = new Solution();
        sl.minimum();
    }
    void minimum(){
        if(num1<num2)
            System.out.println("Smallest Number:"+num1);
            else if (num2<num1)
                System.out.println("Smallest Number:"+num2);
            else if(num1==num2)
                System.out.println("Both are equal: "+num1+num2);
    }
}