1964 IMO Problem #4

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Online Resources:

Books:
+ Djukic, et al. (2011) The IMO Compendium 1959-2009, Springer, 2nd edition.
+ Greitzer (1978), International Mathematical Olympiads 1959-1977, Mathematical Association of America (MAA).
+ Klamkin (1986), International Mathematical Olympiads 1978-1985, Mathematical Association of America (MAA).
+ Kuczma (2000), International Mathematical Olympiads 1986-1999, Mathematical Association of America (MAA).
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This helped me a lot. I interpreted the question in the wrong way, guess I should read the question more clearly. :)

muhammedshameel
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Ramsey numbers! So easy and so hard! We use the pigeonhole principle (PHP) here.

OsmanNal