#include<iostream.h>
#include<stdio.h>
#include<fstream.h>


int main(int argc, char** argv){

	if(argc<2){
		printf("\n%s number_file", argv[0]);
		return 1;
	}
	ifstream infile;
	infile.open(argv[1]);
	if(!infile){    
		cout<<"error!"<<endl;
		return 1;
	}
	double sum=0;
	double input=0;
	long n=0;

	while(!infile.eof()){
		
		infile>>input;
		//cout<<input<<endl;
		if(!infile.eof()){ //so that we don't get a stray increment of n
			sum+=input;
			n++;
		}
	}


	double average=sum/(double)n;
	printf("n: %d sum: %f avg: %f",n,sum, average);
	return 0;
}