5
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Let a # b = a*10 + b
Example :

5 # 5 = 55
9.5 # 3 = 98

Arrange numbers 1 to 7 to each piano's-white-keys.
Then arrange operators (+,-,x,/, and #) to each piano's-black-keys.
Operation is done from left to right.

(((((C op1 D) op2 EF) op3 G) op4 A) op5 B)

The result must be 3000.

Example:
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(((((3/6) + 14) * 7) - 2) # 5) = 1000

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Solution:

$$\begin{array}{|c|c|c|c|c|c|c|c|c|c|c|c|}\hline\\C&\text{op1}&D&\text{op2}&E&F&\text{op3}&G&\text{op4}&A&\text{op5}&B\\\hline5&/&2&+&7&3&\#&1&-&6&×&4\\\hline\end{array}$$

(((((5/2)+73)#1)-6)×4) → ((((((5/2)+73)*10)+1)-6)*4) = 3000

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