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Omni-MATH / Let x₁,…,x₁₀₀ be nonnegative real numbers such that x_(i)+x_(i+1)+x_(i+2)≤1 for all i=1,…,100 (we put x₁₀₁=x₁,x₁₀₂=x₂). Find the maximal possible value of the sum …

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Let x1,…,x100x_1, \ldots , x_{100} be nonnegative real numbers such that xi+xi+1+xi+2≤1x_i + x_{i+1} + x_{i+2} \leq 1 for all i=1,…,100i = 1, \ldots , 100 (we put x101=x1,x102=x2).x_{101 } = x_1, x_{102} = x_2). Find the maximal possible value of the sum S=∑i=1100xixi+2.S = \sum^{100}_{i=1} x_i x_{i+2}. [i]
Plain-text mathematical notation (without MathML)
Let x₁,…,x₁₀₀ be nonnegative real numbers such that x_(i)+x_(i+1)+x_(i+2)≤1 for all i=1,…,100 (we put x₁₀₁=x₁,x₁₀₂=x₂). Find the maximal possible value of the sum S=∑_(i=1)¹⁰⁰x_(i)x_(i+2).


[i]
Original LaTeX notation
Let $x_1, \ldots , x_{100}$ be nonnegative real numbers such that $x_i + x_{i+1} + x_{i+2} \leq 1$ for all $i = 1, \ldots , 100$ (we put $x_{101 } = x_1, x_{102} = x_2).$ Find the maximal possible value of the sum $S = \sum^{100}_{i=1} x_i x_{i+2}.$


[i]

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