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Try looking at breaking apart the massive thing first, from there on in it becomes easy.
1. break up into the smaller numbers
2. add the smaller numbers
3. save this total
4. display this total
...

Think logically how you would do this. On paper you would write down the numbers and then add each one to the next till you have a total.
In a computer you have to first "write" down the numbers by...

Can you give me an idea of what you have already and what code you have tried please.