Create this conditional calculation field

Hi everyone
I want to create this conditional calculation field in Gravity Forms, but I am getting an invalid formula error. Please help.

IF({8} == 1, {10} * {17},
IF({8} == 2, {11} * {17},
IF({8} == 3, {12} * {17},
IF({8} == 4, {13} * {17},
IF({8} == 5, {14} * {17},
0
)
)
)
)
)

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