#include <iostream>
#include <iomanip>
#include <math.h>
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;
}

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