Evaluating Sum of a Series

import java.io.*;
class Calc{
    private static String getInput(String prompt){
        BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
        System.out.print(prompt);
        System.out.flush();
        try{
            return stdin.readLine();
        }catch(Exception e){
            return "Error: " + e.getMessage();
        }
    }
    public static void main(String[] args){
        float sum = 1;
        String input = getInput("Enter the limit: ");
        int n = Integer.parseInt(input);
        if(n>0){
            System.out.print("1/(1.0)^2");
            for(float i=2; i<=n; i++){
                System.out.print(" + 1/("+i+")^2");
                sum += 1/(i*i);
            }
            System.out.print(" = " +sum);
        }
        else
            System.out.print("Error: Not a positive number.");
    }
}

// Output:-
// Enter the limit: 5
// 1/(1.0)^2 + 1/(2.0)^2 + 1/(3.0)^2 + 1/(4.0)^2 + 1/(5.0)^2 = 1.4636111