In Moscow, there are 2000 rock climbers, in St. Petersburg and Krasnoyarsk - 500 each, in Yekaterinburg - 200, and the remaining 100 are scattered across Russia. Where should the Russian Rock Climbing Championship be held to minimize the transportation costs for the participants?

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Match each climber not living in Moscow with one Muscovite. Each such pair (there are 1300 of them) is indifferent to where to host the championship, on the segment between Moscow and the corresponding city. But there are still 700 climbers from Moscow left, for whom it is, of course, more beneficial to host the championship in Moscow. Therefore, it should be held there.

## Answer

In Moscow.