#include <iostream>#include <iomanip>#include <cmath>using namespace std;
int main(){ int n,x,y,i; float p=1, mg=1; do { cin>>n; } while ((n<=1)&&(n>10)); for (i=1; i<=n; i++) { cin>>x; p=p*x;
} mg=pow(p,1.0/n); cout <<fixed<<setprecision(2)<<mg; return 0;}