Equation $x^4+ax^3+bx^2+cx+1=0$ has real roots ($a,b,ca,b,c$ are non-negative). Maximum real value of $c$ is
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Equation $x^4+ax^3+bx^2+cx+1=0$ has real roots ($a,b,ca,b,c$ are non-negative). Maximum real value of $c$ is