a = []
N = 2017
k = 0
m = 0
for i in range(0, N):
a.append(int(input()))
for i in a:
if a[i]%16 < 10:
break
else:
while a[i]>0:
a[i] = a[i]//16
k += 1
if k == 3:
m += a
print(m)
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