#include <iostream>
using namespace std;
 
bool power(double a, double n, double m){
	double res = 1;
	for (int i = 1; i <= n; i++){
		res *= a;
		if(res > m) return false;
	}
 
	return true;
 
}
 
double findNthRootOfM(int n, int m){
	double l = 1, r = m;
	while(r-l > 1e-6){
		double mid = (l + r)/2;
		if(power(mid, n, m)){
			l = mid;
		}
		else r = mid;
	}
 
	return l;
}
 
 
int main() {
	// your code goes here
	cout << findNthRootOfM(3, 27);
	return 0;
}

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