C++ a little help?

I am new to C++ and am trying to read the amount of numbers in a file and count them using a counter-controlled for loop. Can anyone help me. I know how to open up the file, but dont know what to do next.

ifstream fin; //infile.
int number;

fin>>number;//reads in a single number(not a single character)

//presuming the first number in the file tells you how many numbers are to come in the file, just use a for or while loop to read in the rest of the numbers and add them as you go along. While loop is probably best so you can include a !fin.eof() statement to abort the loop if you reach the end of the file before the requested number are read.