Tontti

h, w, n = [int(i) for i in raw_input().split()]

rows = []

for y in range(h):
    q = raw_input()
    rows.append([])
    for x in range(w):
        rows[-1].append(int(q[x] == "*"))
if n==0:
    print 0
else:
    r = 0
    for x in range(w):
        for y in range(h):
            for s in range(int(n**0.5), min(w-x+1, h-y+1)):
                if sum([sum(q[x:x+s]) for q in rows[y:y+s]]) == n:
                    r+=1
    print r

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