Logic at end of do while not working

[PrincessProgram]

/* This the necklace number program it will start with the 2 number
that the user enter and will do the sum of the numbers till it gets
back to what the 2 starter number were.

Count = 1
Sum = 0
Have the user enter the first number
Have the user enter the second number
First = N1
Second = N2
Sum = first + second
Do {
Sum = (second + sum) %10
Count=+
Output the numbers
First = second
Second = sum
} while (sum =N2) & (second = N1)
Output count

28/10/10 By:Lelanie */
int main()
{
int Count = 1;
int sum = 0;
int Num1=0, Num2=0;
int first, second;
cout << "Enter the first number: ";
cin >> first;
cout << "Enter the second number: ";
cin >> second;
Num1 = first;
Num2 = second;
sum = first + second;
cout << first<<" "<<second<<" "<<sum<<" ";
do {
sum = (second + sum)%10;
Count++;
cout << sum << " ";
second = first;
sum = second;
}while ((sum != Num1) || (second != Num2));
cout << endl;
cout << "It took " << Count << " step to make the necklace.\n";
return 0;
}

okay normally this works but when i make it work it would. it goes though 1 loop then stops. i tried it with a or statement but i am wondering if there is anything that i am missing that i have not notice. if you can sread some light on what my problem is i will love that. and if you can't thank you anyway for trying.

[hamsterman]

well, one odd thing is

second = first;
sum = second;

which is the same as

second = Num1;
sum = Num1;

which is probably not what you want.
It would be easier to help, if you said what the program is supposed to do..
Also, [code] [/code] tags.

[PrincessProgram]

i added what the program is to do now