What will be the output of the following C++ code?

#include <stdio.h>
int main ()
{
    FILE * p;
    int c;
    int n = 0;
    p = fopen ("myfile.txt", "r");
    if (p == NULL) 
        perror ("Error opening file");
    else
    {
        do {
            c = getc (p);
            if (c == '$') 
                n++;
        } while (c != EOF);
        fclose (p);
        printf ("%d\n", n);
    }
    return 0;
}