String piyush and magical park problem

#1

print the maximum strength that he can gather in the park in a new line. I am not getting why value is 13 over here

#2 
4 4 5 20
. . * .
. # . .
* * . .
. # * *
S=20 and k=5;

first row:
20-2-1-2-1+5-1-2=16

second row:
16-2=14 (Now, he cannot move any further)

third row: -1 for changing the row 
14-1+5-1+5-1-2-1-2=16

 fourth Row:
16-2-1=13

As 13 >=5, Print “Yes” and 13
#3

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