Multiple IF statements and LEFT function in one cell

[roadwreck]

Hello

In column C i have ID numbers. The first digit refers to gender and in column D needs values based on that. If it is male than "M" and if female than "F".

3 and 5 - male
4 and 6 - female

I have tried using different IF nesting functions but haven't found one that works. For example =IF(LEFT(C3;1)=3;5;"M";IF(LEFT(C3;1)=4;6;"N")), but this says that too many arguments for this function.

Hopefully someone can lead me to the right path with this