#include <iostream>
using namespace std;
 
int main() {
    uint64_t x;
    cin >> x;
    uint64_t a=1, b=1;
    int i = 1;
    while (x) {
        if (i*i <= i*i*i) {
            if (x == i) {
                cout << i*i;
                return 0;
            }
            i++;
        } else {
            if (x == i) {
                cout << i*i*i;
                return 0;
            }
            i++;
        }
        x--;
    }
    cout << "Cx not found";
    return 0;
}

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10