Bar puzzle

[jasen]

5 man enter a bar.
1st man order 1 Pepsi + 1 Coca cola 
2nd man order 2 Pepsi + 1 Coca cola 
3rd man order 3 Pepsi + 1 Coca cola 
4th man order 4 Pepsi + 1 Coca cola 
5th man order 5 Pepsi + 1 Coca cola 
But they ask the bartender to give them same amount of drinks.

as a logician and mathematician the bartender comes with a solution,
he gives each man a glass of cocktail, and they all happy.

Explain why the bartender gives each man a glass of cocktail ?

[jasen]

To avoid the customers' disappointement, the bartender comes up with a solution.
He gives each man a glass of cocktail, and explains :

If each letter represents a digit, we can write it like this :

1 pepsi + 1 cocacola = 1 cocktail  -> 1 *  40497 + 26212681 = 26253178
2 pepsi + 1 cocacola = 1 cocktail  ->  2 * 27264 + 58535813 = 58590341
3 pepsi + 1 cocacola = 1 cocktail  -> 3 * 20239 + 54515481 = 54576198
4 pepsi + 1 cocacola = 1 cocktail  -> 4 * 18153 + 64606420 = 64679032
5 pepsi + 1 cocacola = 1 cocktail  -> 5 * 12149 + 73707350 = 73768095

[jasen]

Clue :  Convert Letters to Numbers.