C++ :

#include <iostream>
#include <cstdio>
using namespace std;
int main()
{
	int a,b,count=0;
	cin>>a>>b;
	for(int i=a;i<=b;i++)
	{
		if(i%6==0 || i%8==0)
		{
			count++;
		}
	}
	cout<<count<<endl;
	return 0;
}

Pascal :

var a,b,i,sum:longint;
begin
  readln(a,b);
  sum:=0;
  for i:=a to b do
    if (i mod 6=0) or (i mod 8=0) then inc(sum);
  writeln(sum);
end.