If your number is in A8, enter in B8:
=SUMPRODUCT((A8=A$1:A$6)*("ISM"=C$1:C$6))

HTH
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AP

"Axel" a écrit dans le message de
...
Hi

i need to know, how much people belongs to the number in Colum A - if in
colum C is written "ISM".

A B C
1 1 Meier ISM
2 3 Huber ISM
3 2 Schmitz UPA
4 2 Mayer ISM
5 1 Mueller UPA
6 1 Hase ISM

if somebody can help me, i would appreciate!