#include <iostream>
#include <vector>
using namespace std;
int am_dig(int k){
int res = 0;
while(k > 0){
res++;
k /= 10;
}
return res;
}
double average(vector<double> a){
double sum = 0;
for(auto i: a)
sum += i;
return sum/a.size();
}
int main() {
vector<double> a;
double x = 1;
while(x != 0){
cin >> x;
if(am_dig(x) == 3)
a.push_back(x);
}
if(a.size() == 0)
cout << "NO";
else
cout << average(a);
}
var a: array[1..10] of integer;
i: integer;
begin
randomize;
for i:=1 to 10 do
begin
a[i]:=random(21)+10;
write(a[i],' ');
end;
writeln;
for i:=1 to 10 do
begin
a[i]:=a[i]*3;
write(a[i],' ');
end;
end.