3 ┴╛╖∙└╟ ╕±╖╧└╗ ░ⁿ╕«╟╥ ╝÷ └╓╜└┤╧┤┘: └τ╗²╕±╖╧, ╞─└╧ ╕±╖╧ ▒╫╕«░φ ╡Ñ└╠┼═ ╝╥╜║. ╕±╖╧ ░ⁿ╕«└┌ ┤δ╚¡├ó└╗ └╠┐δ╟╧┐⌐ └╠╡Θ ╕±╖╧┐í╝¡ └█╛≈╟╥ ╝÷ └╓╜└┤╧┤┘.
└τ╗²╕±╖╧┐í ┤δ╟╤ ╕±╖╧ ░ⁿ╕«└┌ ┤δ╚¡├ó└╟ ┐╣
╕±╖╧ ░ⁿ╕«└┌ ┤δ╚¡├ó└╗ ┼δ╟╪, ╞φ┴²▒Γ└╟ │╗║╬ ╡Ñ└╠┼═ ║ú└╠╜║┐í └·└σ╡╚ └╠╖»╟╤ ╕±╖╧└╗ ╗²╝║, ╗Φ┴ª ▒╫╕«░φ ╝÷┴ñ╟╥ ╝÷ └╓╜└┤╧┤┘. ┐⌐▒Γ┐í┤┬ ├╣╣°┬░ ░Φ└º ╖╣║º┐í ┴÷┴÷╡╚ ╕±╖╧└╟ 3░í┴÷ └»╟ⁿ└╗ ╞≈╟╘╟╧░φ └╓┤┬, ╗τ┐δ░í┤╔╟╤ ╕±╖╧ ╞«╕«░í ╞≈╟╘╡╟╛ε └╓╜└┤╧┤┘ : └τ╗²╕±╖╧, ╞─└╧ ╕±╖╧ ▒╫╕«░φ ╡Ñ└╠┼═ ╝╥╜║. ╞«╕«└╟ ╖╣║º 2┤┬ ╕±╖╧ └╠╕º└╗ │¬┼╕│└┤╧┤┘. ┤δ╚¡├ó└╟ ┐∞├° ║╬║╨┐í┤┬ ╕±╖╧ ╞»└»└╟ ┴ñ║╕░í ╞≈╟╘╡╟╛ε └╓╜└┤╧┤┘. ╞«╕«┐í╝¡ ╛ε╢░╟╤ ╟╫╕±╡╡ ╝▒┼├╡╟┴÷ ╛╩╛╥░┼│¬ ╢╟┤┬ └╧║╬ ╖╣║º 1 │δ╡σ░í ╝▒┼├╡╟╕Θ, ┤δ╚¡├ó└╟ ┐∞├° ╞Σ└╬└║ ║±╛ε└╓┤┬ ╗≤┼┬╖╬ │▓╛╞ └╓╜└┤╧┤┘ (╢╟┤┬ ╚∙╞« ┴ñ║╕╕ª ╞≈╟╘╟╧░φ └╓╜└┤╧┤┘). ╞«╕« ╛╞╖í┐í┤┬ 2░│└╟ ╣÷╞░└╠ └╓╜└┤╧┤┘ - ╗⌡╖╬┐ε ▒╫╕«░φ ╗Φ┴ª.
╗⌡╖╬┐ε└╗ ┼¼╕»╟╧╕Θ, ╞«╕«┐í╝¡ ╗⌡╖╬┐ε ╟╫╕±└╠ ╟÷└τ ╝▒┼├╡╚ ╖╣║º 1 ╞«╕« │δ╡σ ╛╞╖í┐í╝¡ ╗²╝║╡╦┤╧┤┘. ╖╣║º 2 │δ╡σ╕ª ╝▒┼├╟╧░╘ ╡╟╕Θ, ╗⌡╖╬┐ε ╟╫╕±└║ ╟÷└τ ╝▒┼├╡╚ ░═░· ░░└║ └»╟ⁿ└╠ ╡╦┤╧┤┘. ╗⌡╖╬┐ε ╟╫╕±└║ ╛╓╟├╕«─╔└╠╝╟┐í └╟╟╪ ╗²╝║╡╚ └»└╧╟╤ └╠╕º└╗ ░«░╘ ╡╦┤╧┤┘. └╠ ╗⌡╖╬┐ε ╟╫╕±└╠ ╝▒┼├╡╟░φ ┤δ╚¡├ó└╟ ┐∞├° ║╬║╨└║ ╝╙╝║└╗ ╡≡╜║╟├╖╣└╠╟╧░╘ ╡╦┤╧┤┘.
╗Φ┴ª╕ª ┼¼╕»╟╧╕Θ, ┤┘└╜░· ░░└║ ╕▐╜├┴÷░í │¬┼╕││┤╧┤┘: ╕±╖╧ <╕±╖╧ ╟╫╕± └╠╕º>└╗ ┴ñ╕╗╖╬ ╗Φ┴ª╟╧╜├░┌╜└┤╧▒ε? 2░│└╟ ╣÷╞░└╗ ╡┐╣▌╟╒┤╧┤┘ - ┐╣, ▒╫╕«░φ ╛╞┤╧┐└. ┐╣╕ª ╝▒┼├╟╧╕Θ, ╝▒┼├╡╚ ╕±╖╧└╠ ┴ª░┼╡╦┤╧┤┘. ╞«╕«└╟ └╠└ⁿ │δ╡σ░í ╝▒┼├╡╦┤╧┤┘. └╠ ╕±╖╧└╠ ╛ε╢▓ ╡≡└┌└╬└╟ ┼╪╜║╞« ╟╩╡σ┐í╝¡ ╗τ┐δ╡╟╛·└╕╕Θ, ╛ε╢░╟╤ ├▀░í ╚«└╬╡╡ │¬┼╕│¬┴÷ ╛╩░φ ╟╪┤τ ┼╪╜║╞« ╟╩╡σ┤┬ ║±╛ε└╓┤┬ ╣«└┌┐¡╖╬ └╬╝Γ╡╦┤╧┤┘.
╞«╕«┐í╝¡ ╖╣║º 1 │δ╡σ░í ╝▒┼├╡╟╕Θ, ╗Φ┴ª ╣÷╞░╡╡ ╚░╝║╚¡╡╦┤╧┤┘. └╠░═└╗ ┼¼╕»╟╧╕Θ ┤┘└╜░· ░░└║ ╕▐╜├┴÷░í │¬┼╕││┤╧┤┘: ┴ñ╕╗╖╬ [└τ╗²╕±╖╧|╞─└╧ ╕±╖╧|╡Ñ└╠┼═ ╝╥╜║]╕ª ╕≡╡╬ ╗Φ┴ª╟╧╜├░┌╜└┤╧▒ε? 2░│└╟ ╣÷╞░└╗ ╡┐╣▌╟╒┤╧┤┘ - ┐╣ ▒╫╕«░φ ╛╞┤╧┐└. ┐╣╕ª ╝▒┼├╟╧╕Θ, ╝▒┼├╡╚ │δ╡σ ╛╞╖í┐í └╓┤┬ ╕≡╡τ ╕±╖╧└╠ ┴ª░┼╡╦┤╧┤┘. ╖╣║º 1 │δ╡σ┤┬ ╝▒┼├╡╚ ╗≤┼┬╖╬ │▓╛╞└╓░╘ ╡╦┤╧┤┘.
┐∞├° ╞Σ└╬└║ ╝│┴ñ╡╚ ╕±╖╧└╟ ░ó └»╟ⁿ┐í ╡√╢≤ ┤┘╕¿┤╧┤┘. ║╕┤┘ ╗≤╝╝╟╤ ┴ñ║╕┤┬ └τ╗²╕±╖╧┐í ┤δ╟╤ ┐∞├° ╞Σ└╬, ╞─└╧ ╕±╖╧┐í ┤δ╟╤ ┐∞├° ╞Σ└╬, ▒╫╕«░φ ╡Ñ└╠┼═ ╝╥╜║┐í ┤δ╟╤ ┐∞├° ╞Σ└╬ ║╬║╨┐í╝¡ ┬ⁿ┴╢╟╧╜╩╜├┐└.