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We are excited to announce a new Blitz Round happening on February 22, 2026. This is a rated competition for participants with rating $\le 1750$.

A store offers an assortment of toys of various types. For each type, the number of toys and the price of one toy are known. Determine the total number of toys with a price less than $50$ hryvnias.

We are excited to announce new Weekend Practice round happening on Sunday, February 15, 2026. This is rated competition for everyone.

We are excited to announce 8-th Education round starting on Monday, February 9. This round is based on the problems from the archieve. This is not a rated contest but it is a good opportunity to practice tasks of varying difficulty.

We are excited to announce new Blitz Round happening on February 8, 2026 at 11:30 UTC. This is rated competition for participants with rating $\le 1750$.

A number is called massive if it can be written in the form $a^n$, that is, $a$ raised to the power of $n$.

We are excited to announce a new Weekend Practice round happening on February 1, 2026 at 15:00 UTC. This is a rated competition for everyone.

We are excited to announce new Blitz Round happening on January 25, 2026 at 13:00 UTC. This is rated competition for participants whose rating is less or equal 1750.

Join us for Blitz Round #11 on January 25, 2026, at 16:00 UTC!

For the celebration, the Professor bought balloons of three colors: blue, red, and yellow. In total, he bought $n$ balloons. The number of yellow and blue balloons is $a$, and the number of red and blue balloons is $b$.

We are excited to announce new Weekend Practice round happening on January 18, 2026 at 15:00 UTC. This is rated competition for everyone.

We are excited to announce a new Blitz Round happening on January 11, 2026 at 11:00 UTC. This is a rated competition for participants with rating $\le 1750$.

We are excited to announce a new Weekend Practice round happening on Sunday, January 4 at 15:00 UTC. This is a rated competition for everyone.

Hi Eolymp Community!

We are excited to announce new Blitz Round happening on December 28, 2025 at 11:00 UTC. This is rated competition for participants whose rating is less or equal 1750.

We are excited to announce a new Weekend Practice round happening on December 21, 2025 at 15:00 UTC. This is a rated competition for everyone.

Recently, information has been spreading on the internet about our company's ties with the russian federation. We officially state: our company has no ties with the russian federation and does not cooperate with russian or pro-russian companies or websites. Our priorities are openness, integrity, honesty, and dedication to improving education in Ukraine and promoting Ukrainian worldwide.

We are excited to announce new Blitz Round happening on December 14, 2025 at 11:00 UTC. This is rated competition for participants whose rating is less or equal 1750.

We are excited to announce new Weekend Practice round happening on December 7, 2025 at 15:00 UTC. This is rated competition for everyone.

We are excited to announce new Blitz Round happening on November 30, 2025. This is rated competition for participants whose rating is less or equal 1750.

Solve the quadratic equation $a\cdot x^2+b\cdot x+c=0(a\ne 0)$.

From now on, you can earn Eolymp Mints by helping us improve the platform. Submit suggestions for problem improvements—whether it's fixing typos, adding translations, or writing solution editorials—and receive rewards based on the value of your contribution.

We are excited to announce new Blitz Round happening on November 16, 2025 at 11:00 UTC. This is rated competition for participants whose rating is less or equal 1600.

You are going to toast some slices of bread for an upcoming party. You have a frying pan that can hold at most $k$ toasts at the same time. Toasting one side of a toast takes $2$ minutes.

We are excited to announce a new Weekend Practice round happening on November 9, 2025 at 15:00 UTC. This is a rated competition for everyone.