#!/usr/bin/env python3

def power(x):
    #brute force, ni glih nek algo.. jbg, deluje
    a=2
    maxim=0
    while a<x:
        b=1
        while b<x:
            k=sum(digitize(a**b))
            if k>maxim:
                maxim=k
            b+=1
        a+=1
    return maxim

def digitize(x):
    if x<10:
        return [x]
    return [x%10]+digitize(x//10)

if __name__ == '__main__':
    print(power(100))