17-4

#include<iostream>
#include<fstream.h>
#include<iomanip.h>
int main(){
ifstream f1("numere.txt");
int x,i=0;
float ma,s=0;
while(f1>>x)
	if(x>0){
		s=s+x;
		i++;}
ma=s/i;
f1.close();
cout<<fixed<<setprecision(2)<<ma;}