What will be the output of the following C code?

#include <stdio.h>
#include <stdarg.h>
void func(int, ...);
int main()
{
    func(2, 3, 5, 7, 11, 13);
    return 0;
}
void func(int n, ...)
{
    int number, i = 0;
    va_list start;
    va_start(start, n);
    while (i != 3)
    {
        number = va_arg(start, int);
        i++;
    }
    printf("%d", number);
}