我有一个多天的数据集。每天的记录数不一样。我想对每天的余额进行求和，但是我希望在一天中的正记录数大于2中的负记录数时停止求和！

数据集（我刚才要解释的是，列Obs不在数据集上）是

Day  Situation   Result    Obs
01    POSITIVE    +1     will be add 
01    POSITIVE    +2     will be add
01    POSITIVE    +3     Will not be add,because there is already 2 Positive and 0 negative on this day
01    NEGATIVE    -4     Will not be add ...
02    NEGATIVE    -1     Will be add
02    POSITIVE    +2     add
02    POSITIVE    +1     add
02    POSITIVE    +3     add
02    POSITIVE    +5     Will not be add,because there is already 3 Positive and 1 negative on this day
03    POSITIVE    +1     add
03    NEGATIVE    -1     add
03    NEGATIVE    -2     add
03    NEGATIVE    -3     add
03    NEGATIVE    -4     add
03    POSITIVE     5     add
03    POSITIVE     6     add
03    POSITIVE     7     add
03    POSITIVE     8     add
03    POSITIVE     9     add
03    POSITIVE     10    will not be add,because there is already 6 positive and 4 negative

每天的总和是：
第一天：+ 1 + 2 = +3
第02天：-1 + 2 + 1 + 3 = +5
第三天：1-1-2-3-4+5+6+7+8+9=+26

我如何使用EXCEL公式？