# include <stdio.h>

/** Emfanisi mesou arithmon apo arxeio xoris diamorfosi **/

int main()
{
	int n,i;
	double x;
	double average=0.0;
	char filename[100];
	FILE *fp;
	printf("Doste onoma arxeiou ?\n");
	gets(filename);
	fp=fopen(filename,"r");
	if(fp==NULL)
	{
		printf("To arxeio %s den yparxei i den mporeite na to diabasete \n",filename);
	}
	else
	{
	
		n=0;
		while(fscanf(fp,"%lf",&x)>0)
		{
			n++;
			average+=x;
		}
		average/=n;
		printf("O mesos oros ton arithmon einai %.2lf\n",average);
		fclose(fp);
	}
	return 0;
}