Help Creating a SUMIFS (Running Total) Formula

Can anyone help me write a formula that will find the value of cells in column L?

I'd like to write a formula that will keep a running total (sumifs) of column K values IF: C="@*", M>=N*3.

An example of this formula working properly looks like this example:

C------K------L------M------N
@AB--(100)-(100)---(0)-----(0)
@AC--(105)-(205)---(1)-----(0)
@AD--(110)-(325)---(2)-----(0)
GH----(100)-(325)---(2)-----(0)
@TB--(-120)-(205)--(2)-----(1)
@RH--(100)--(205)--(3)-----(1)
@VC--(100)--(305)--(4)-----(1)

What is wrong with the formula that you already have in column L?

Do you wish this:
=SUMPRODUCT(K$1:K3,(LEFT(C$1:C3,1)="@")*($M$1:M3>=$N$1:N3*3))

Izandol, your formula is VERY close to what I'm looking for. The point of contention exists in K94 & K111. I would like the PREVIOUS row's information to determine the formula. Attached is a revised version of the file with how I would like the formula's final product to look like. I highlighted the problem areas in grey.

The logic is this:

L5: 1) C5 contains "@*", 2) M4>=N4*3 therefore: sum value of K5 105.

L21: 1) C5 contains "@*", 2) M20>=N20*3 therefore: sum value of K21 120.

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L111: 1) C111 contains "@*", 2) M110<>>=N100*3 therefore: do not sum value of K111

I was able to make the formula work, but I couldn't have done it without your help.

ONE LAST question:

Can you add a criteria to the formula? Can you make it so that the formula does the exact same thing only to make it so that the sum of N & M has to be >= 1 as well?

Do you mean this:
=SUMPRODUCT(K$2:K4,(LEFT(C$2:C4,1)="@")*($M$1:M3>=$N$1:N3*3)*($M$1:M3+$N$1:N3>=1))

Remarkable! Thanks.