ABC097B - Exponential

問題：B - Exponential

#include <algorithm>
#include <cmath>
#include <iostream>
using namespace std;

int main(void){
    int x, ans = 1;
    
    cin.tie(0);
    ios::sync_with_stdio(false);
    cin >> x;
    for (int b = 2; b <= x; ++b) {
        for (int p = 2; (int)pow((double)b, (double)p) <= x; ++p) {
            ans = max(ans, (int)pow((double)b, (double)p));
        }
    }
    
    cout << ans << "\n";
    return 0;
}