1.#include <iostream>
using namespace std;
int main(){
int n,s=0,x,i;
cin >> n;
for(i = 0; i < n; i++){
cin >> x;
s += x;
}
cout << ((float) s) / ((float) n) << endl;
return 0;
}
2.#include <iostream>
using namespace std;
int main(){
int x,p = 1;
cin >> x;
while(x != 0){
p *= x;
cin >> x;
}
cout << p << endl;
return 0;
}