Python Program that reads a matrix MN which represents the map and prints the number of enemies ready to attack the kingdom:

#$2$D array to store map of kingdom

arr$=[]$

#Take input from user for size of matrix

$[$M$][$N$]=$ int$($input$())$

#Taking values from user

for i in range$(0,$M$)$:

arr.append$([$int$($j$)$ for j in input$().$split$()])$

#$2$D list to store true or false

#True represent current block is already visited

#False represent not visited

check $=[]$

#initially all values set to false

for i in range$($M$)$:

temp $=[]$

for j in range$($N$)$:

temp.append$($False$)//$appends an element to end of the list

check.append$($temp$)$

#variable to store the final sum

sum $=$ int$(0)$

for i in range$($M$)$:

for j in range$($N$)$:

if arr$[$i$][$j$]==0$:

if i$!=0$ and check$[$i$-1][$j$]==$ False:

check$[$i$-1][$j$]=$ True

sum $=$ sum$+$arr$[$i$-1][$j$]$

if j$!=0$ and check$[$i$][$j$-1]==$ False:

check$[$i$][$j$-1]=$ True

sum $=$ sum$+$arr$[$i$][$j$-1]$

if j$!=$N$-1$ and check$[$i$][$j$+1]==$ False:

check$[$i$][$j$+1]=$ True

sum $=$ sum$+$arr$[$i$][$j$+1]$

if i$!=$M$-1$ and check$[$i$+1][$j$]==$ False:

check$[$i$+1][$j$]=$ True

sum $=$ sum$+$arr$[$i$+1][$j$]$

print$($sum$)$