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| N = int(input())
table = []
counter = 0
for i in range(N):
line = list(map(int, input().split()))
table.append(line)
dxdy = [
(0,1),
(0,-1),
(1,0),
(-1,0),
]
for j in range(1, N-1):
for h in range(1, N-1):
for dx, dy in dxdy:
if table[j][h] > table[j+dx][h+dy] - 50: break
else: counter += 1
print(counter)
|