Pot Solution:

import java.util.Scanner;

public class Kattis {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    long sum = 0;
    int cases = Integer.parseInt(sc.nextLine());
    for (int i = 0; i < cases; i++) {
      String line = sc.nextLine();
      sum += Math.pow(Integer.parseInt(line.substring(0, line.length()-1)), line.charAt(line.length()-1)-'0');
    }
    System.out.println(sum);
  }
}