import java.util.*;
import java.io.*;

public abstract class Evaluator{
    abstract float evaluate(int[] permutation);
}

class SillyEvaluator extends Evaluator{
    // this evaluates a simple function on the permutation
    float evaluate(int[] permutation){
	double d=1;
	for(int i=0;i<permutation.length-1;i++)
	    d+=(permutation[i]-permutation[i+1])*(permutation[i]-permutation[i+1])*(i+1);
	return (float)d;
    }
}