Record value, drop it & record again

M

Micos3

Hi
i want to put value in A1 (ex.) and view the value in A3, then i want to put value again in A1 and that the value in A1 be the sum of the 1 number i puted +2 number i puted there, but the final result be like the figure blow!

A1 x A2 = A
5 1 5 1st value pute
3=8 1 3 2nd value pute

Anyone understand what i discrived and can help me?
 
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