Match 2 Columns and Add the Values of Third Column

[njsidd]

Hello,

By matching two column I want to add the third column, but only the desire
model


Model Size (mm) QTY
JE-122 50 2
JE-123 80 2
JE-124 100 3
JE-125 150 4
JE-122 50 1


Expected Result:

Model Size (mm) QTY
JE-122 50 3


Can some one help me in this regard???