sum with multiple sheets

[shijilorotelu]

hi everyone, need little help here

i have 2 dropdwon list, each list represents the name of my sheets.
i want to sum value at the same cell of my sheets by choose it with my dropdownlist.

so, when i choose sheet #1 and sheet #3
it will sum value at cell A1 from sheet #1 , sheet #2 , and sheet #3

may you help me with the formula...

thank you.

 

[markmzz]

thank you for your help man \m/

You're welcome.

Markmzz