4 input compare help

kind of new @ , i've run roadblock.

anybody have ideas on how check status of 4 digital inputs , if 3 of them have gone high, set flag bit?

basically i'm trying check 4 reed switches, , if 3 of them have been tripped set bit can use trigger rest of code in loop. (i want 3 out of 4 redundancy , fault tolerance.

i thinking checking pins, , adding 1 bit if result true, , doing each input, if total >3 setting flag, keep adding if 1 switch tripped.

or maybe large comparison statement?

any ideas?

thanks,

maybe try (in psuedo)

while((input1 + input2 + input3 + input4) < 3)
                        ->do nothing

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