## DEV Community

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# Hey folks

Project Euler is a series of challenging mathematical/computer programming problems that I like to start. I'm sure there will be a lot to learn for me, and I would like to share my solutions here in DEV.

❓ Here is problem 001:

If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6, and 9. The sum of these multiples is 23.
Find the sum of all the multiples of 3 or 5 below 1000.

💡 For solving this problem, we can simply use the Modulo operation and calculate the numbers which are multiples of 3 or 5.

❗ Modulo is a math operation that finds the remainder when one integer is divided by another. In writing, it is frequently abbreviated as a mod, or represented by the symbol %.
For two integers a and b:
a mod b = r
Where a is the dividend, b is the divisor (or modulus), and r is the remainder.

Here is an example:

11 mod 4 = 3, because 11 divides by 4 (twice), with 3 remaining.

💻 So, my solution in Python is:

``````sum = 0

for integer in range(1, 1000):
if integer % 3 == 0 or integer % 5 == 0:
sum += integer
print(sum)
``````

✅ The answer to this problem is `233168`.

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Thank you for your loving directions.