def permut(liste):
    P = [ 5, 9, 3, 6, 1, 4, 2, 7, 8]
    result = [ ]
    for i in P:
        result.append( liste[ i-1 ] )
        
    return result

def sigma(E, n):
    result = E
    for i in range(n):
        result = permut(result)
        
    return result