Tontti

import math
f = []
imp = tuple([int(i) for i in raw_input().split()])
for i in range(imp[0]):
	a = []
	for j in (list(raw_input())):
		if j == "*":
			a.append(1)
		else:
			a.append(0)
	f.append(a)

mi = int(math.ceil(math.sqrt(imp[2])))
a = 0
for o in range(mi, 1+min(imp[0], imp[1])):
	for i in range(imp[0]-o + 1):
		for j in range(imp[1]-o + 1):
			s = 0
			l = f[i:i+o]
			for k in l:
				s += sum(k[j:j+o])
			if s == imp[2]:
				a += 1
print "\n"+str(a)

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 7

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 8

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 9

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 10

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 11

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 15

Group: 3

Verdict: TIME LIMIT EXCEEDED