C1=C2=C3=C4=5нФ

It appears that you are referring to capacitors in a circuit, where \( C_1, C_2, C_3, \) and \( C_4 \) are all equal to 5 nanofarads (5 nF). If you need help with how to calculate the total capacitance of a circuit configuration involving these capacitors (series or parallel), please provide more details about how they are connected in the circuit.